Fixes lost RC on px4fmu-v4
Fixes lost RC on px4fmu-v4

   A recent change in in the fmu stops the instance when a
   xxxx_reset command is used issued if the fmu was not
   already running.

   That change left publications published and then on the
   next creation created a new publications was created.

   This change calls orb_unadvertise to mark the publication
   as un published so that on the next instantiations of the
   fmu it resumes publishing on the same publication.

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