move parameter unittest into systemcmds

.gitignore

.gitmodules

CMakeLists.txt

Makefile

Tools/fix_headers.sh

src/drivers/device/vdev.cpp

src/firmware/posix/sitl_tests.cmake

src/modules/systemlib/param/param.c

src/modules/systemlib/param/param_shmem.c

src/platforms/px4_config.h

src/systemcmds/tests/CMakeLists.txt

src/systemcmds/tests/params.c

src/systemcmds/tests/test_param.c

src/systemcmds/tests/test_parameters.cpp

src/systemcmds/tests/tests_main.c

src/systemcmds/tests/tests_main.h

unittests/.gitignore

unittests/CMakeLists.txt

unittests/googletest

unittests/param_test.cpp