- Ubuntu install NuttX toolchain, gazebo, and switch to python3
 - OSX switch to python3

This should fix the macOS build.

https://lgtm.com/rules/10030086/

    - sitl_gazebo in PX4/Firmware (d36c0e13): https://github.com/PX4/sitl_gazebo/commit/2f0070ec6c29c34b9bae10ac03224775627c338a
    - sitl_gazebo current upstream: https://github.com/PX4/sitl_gazebo/commit/e0dfe7ea45c849e676c201b7428bf8df975d4790
    - Changes: https://github.com/PX4/sitl_gazebo/compare/2f0070ec6c29c34b9bae10ac03224775627c338a...e0dfe7ea45c849e676c201b7428bf8df975d4790

    e0dfe7e 2019-03-11 Jannik Beyerstedt - Fix compiler error with openCV (C++11) on macOS

Parameter update - Add parameter_update.py script used to rename the BlockParam variables with the new strict naming convention

This updates the submodule sitl_gazebo to include the iris_obs_avoid
sdf model

This is a workaround for the write timeout that we have seen for some
host computers trying to flash the firmware.

We don't know the root cause of the problem but we do observed the
following:

- For blocking writes with timeout (Pyserial write_timeout=0.5):
  write() throws SerialTimeoutException. In systrace we see that the
  select() call after write waiting for the write to be finished hangs
  and finally times out.
- For blocking writes without timeout (Pyserial write_timeout=None):
  write() hangs indefinitely. In systrace we see that the
  select() call after write waiting for the write to be finished hangs.
- For non-blocking writes:
  write() works but flush() hangs. In systrace we see that
  ioctl(fd, TCSBRK, 1) which is (correctly) triggered by termios tcdrain
  hangs.

Inspecting USB traffic using usbmon, we can see that the data which is
written actually seems to be sent and looking at responses from the
Pixhawk bootloader and the timings it looks like all the data has
arrived.

This workaround uses non-blocking writes without flushing and this
seemed to prevent the issue from happening so far.

Debugging was done in collaboration with Beat Küng and David Sidrane.

If we dont explicitly check for pyserial, we can have the case where the
import works but the Serial object creation fails. However, we don't see
this because we have this huge try/catch block which swallows
everything.

- fixes #11666

Brings https://github.com/PX4/jMAVSim/pull/97.

- jMAVSim in PX4/Firmware (a97151fe): https://github.com/PX4/jMAVSim/commit/0c25b7c18990a64fc851cfd7fe3aac9a4060aea3
    - jMAVSim current upstream: https://github.com/PX4/jMAVSim/commit/8b2f4568e05935af57782fd0db9a434f733cc800
    - Changes: https://github.com/PX4/jMAVSim/compare/0c25b7c18990a64fc851cfd7fe3aac9a4060aea3...8b2f4568e05935af57782fd0db9a434f733cc800

    8b2f456 2019-02-28 Julian Oes - Merge pull request #95 from PX4/shell-style
3d0174a 2019-02-27 Matthias Grob - Fix shell script style

    - sitl_gazebo in PX4/Firmware (4e792b24): https://github.com/PX4/sitl_gazebo/commit/b34a96e7e5572209d21b9445be048c77ef041baa
    - sitl_gazebo current upstream: https://github.com/PX4/sitl_gazebo/commit/2e80474653bcb7808a7dfced4cf403ef607d69da
    - Changes: https://github.com/PX4/sitl_gazebo/compare/b34a96e7e5572209d21b9445be048c77ef041baa...2e80474653bcb7808a7dfced4cf403ef607d69da

    2e80474 2019-02-18 Elia Tarasov - fix comment for mag strength table unit
9a9a137 2019-02-18 Elia Tarasov - fix comment for the file name
7c49b2f 2019-02-18 Elia Tarasov - add units to mag variables
c004d94 2019-02-18 Elia Tarasov - fix magnetic field calculation by using geo lookup table
e9a3940 2019-02-18 Elia Tarasov - fix comment on magnetic data source and properties
c76ac17 2019-02-18 Elia Tarasov - copy magnetic data tables and functions from ecl/geo_lookup
28f59c5 2019-02-18 Elia Tarasov - add constrain function
8c869ed 2019-02-18 Elia Tarasov - fix linker complain on multiple definitions
b5213a7 2019-02-18 Elia Tarasov - add getters for mag inclination and strength
d311233 2019-02-15 Elia Tarasov - fix D-component of magnetic field for Zurich according to WMM2015

Includes https://github.com/PX4/sitl_gazebo/pull/283

This updates the jMAVSim submodule which includes a fix for HITL.
In order to fix HITL, a CLI argument `-lockstep` was required to enable
lockstep. This has now been added to the command in jmavsim_run.sh.

* refactor ekf analysis part 1: move plotting to functions

* add plot_check_flags plot function

* put plots in seperate file

* use object-oriented programming for plotting

* move functions for post processing and pdf report creation to new files

* add in_air_detector and description as a csv file

* refactor metrics and checks into separate functions

* refactor metrics into seperate file, seperate plotting

* ecl-ekf tools: re-structure folder and move results table generation

* ecl-ekf-tool: fix imports and test_results_table

* ecl-ekf tools: bugfix output observer tracking error plot

* ecl-ekf-tools: update batch processing to new api, fix exception handling

* ecl-ekf-tools: use correct in_air_detector

* ecl-ekf-tools: rename csv file containing the bare test results table

* ecl-tools: refactor for improving readability

* ecl-ekf tools: small plotting bugfixes

* ecl-ekf tools: small bugfixes in_air time, on_ground_trans, filenames

* ecl-ekf-tools: fix amber metric bug

* ecl-ekf-tools: remove custom function in inairdetector

* ecl-ekf-tools: remove import of pandas

* ecl-ekf-tools: add python interpreter to the script start

* ecl-ekf-tools pdf_report: fix python interpreter line

* px4-dev-ros-kinetic: update container tag to 2019-02-13

* ecl-ekf-tools python interpreter line: call python3 bin directly

* ecl-ekf-tools: change airtime from namedtuple to class for python 3.5

* ecl-ekf-tools: update docker image px4-dev-ros-kinetic

* ecl-ekf-tools: fix memory leak by correctly closing matplotlib figures

 - this updates all containers except for px4-dev-snapdragon

    - sitl_gazebo in PX4/Firmware (6178ead6): https://github.com/PX4/sitl_gazebo/commit/12fb19ac6e7695ffc3dc9a64fcdd8499a522bd80
    - sitl_gazebo current upstream: https://github.com/PX4/sitl_gazebo/commit/34d06e042c9dbd336899dbba373e32a6f19828b7
    - Changes: https://github.com/PX4/sitl_gazebo/compare/12fb19ac6e7695ffc3dc9a64fcdd8499a522bd80...34d06e042c9dbd336899dbba373e32a6f19828b7

34d06e0 2019-02-05 Tully Foote - create plane_cam world
93159f3 2019-02-01 TSC21 - CMakeLists: install package.xml
c5882f7 2019-01-31 Anthony Lamping - models: plane: split up, adding plane_cam
38fe49a 2019-02-01 TSC21 - Travis CI: do not pass user id env var to the container
0f1221b 2019-02-01 TSC21 - Travis CI: update Ubuntu container tags
bab0de9 2019-01-31 Anthony Lamping - models: remove matrice 100 opt flow meshes
0efbe69 2019-01-23 Oleg Kalachev - Fix building on macOS

This has changed as we changed to TCP with the lockstep implementation.

 - Jenkins compile drop arch until container is updated and maintained
 - clang-tidy disable for now, the new version isn't respecting the existing configuration

    - jMAVSim in PX4/Firmware (3a7deefe): https://github.com/PX4/jMAVSim/commit/5150bbab6ea3e13907d2ff9eadd2c293d2477d49
    - jMAVSim current upstream: https://github.com/PX4/jMAVSim/commit/00bdf6d92b6a8678f5b683a3ebca9e52e88cb5ce
    - Changes: https://github.com/PX4/jMAVSim/compare/5150bbab6ea3e13907d2ff9eadd2c293d2477d49...00bdf6d92b6a8678f5b683a3ebca9e52e88cb5ce

    00bdf6d 2019-01-21 Beat Küng - jMAVLib: update submodule

Because $sitl_command contains quotes

 * this should fix the CI failures where we intermittently saw SIGABRT. (fixes #11144)

This should fix:
- HITL regression (Init MAVLink forever).
- Starting using default arguments.