Update submodule jMAVSim to latest Wed Mar 6 00:38:35 UTC 2019 (#11597)

- 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

jMAVSim @ 8b2f4568

-Subproject commit 0c25b7c18990a64fc851cfd7fe3aac9a4060aea3
+Subproject commit 8b2f4568e05935af57782fd0db9a434f733cc800