mavsdk_tests: try to prevent auto-disarm
mavsdk_tests: try to prevent auto-disarm

We should not spend too much time sending RC init messages because if it
takes too long, we might auto-disarm in the meantime.

acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware