vmount mavlink input: continue to poll for vehicle_command until reaching the timeout
vmount mavlink input: continue to poll for vehicle_command until reaching the timeout

or receiving a command that we need to handle. This makes sure that we
don't drop commands, when the output mode is set to mavlink (in that case
the input topic is rate-limited, and each input change results in a
vehicle_command publication, which results in queueing up orb items if we
get vehicle_commands from other sources too).

Aerotenna/Firmware,dagar/Firmware,dagar/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,jlecoeur/Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,PX4/Firmware,mcgill-robotics/Firmware,dagar/Firmware,PX4/Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,krbeverx/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,dagar/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,krbeverx/Firmware,krbeverx/Firmware,acfloria/Firmware,acfloria/Firmware,Aerotenna/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,PX4/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,dagar/Firmware,krbeverx/Firmware,dagar/Firmware,PX4/Firmware,PX4/Firmware,PX4/Firmware,krbeverx/Firmware,dagar/Firmware,acfloria/Firmware,krbeverx/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware