Commander: changed logic for checking OA at boot time.

With this commit the use cases will be:

Success case:
- booting, no messages about OA, pre-arm check would fail if you try to arm and OA is not yet running

Fail case:
- if OA takes longer than timeout time defined in COM_ONB_BOOT_T, then an error message is triggered.


Signed-off-by: Claudio Micheli <claudio@auterion.com>