simulator: flush output after waiting message output
simulator: flush output after waiting message output

Just to make sure the user sees the message.

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