scp_upload.sh: use ENV variable to set IP of RPi2
scp_upload.sh: use ENV variable to set IP of RPi2

PX4/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,krbeverx/Firmware,acfloria/Firmware,krbeverx/Firmware,jlecoeur/Firmware,darknight-007/Firmware,dagar/Firmware,jlecoeur/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,acfloria/Firmware,Aerotenna/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,dagar/Firmware,krbeverx/Firmware,dagar/Firmware,dagar/Firmware,jlecoeur/Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,krbeverx/Firmware,jlecoeur/Firmware,Aerotenna/Firmware,darknight-007/Firmware,PX4/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,darknight-007/Firmware,PX4/Firmware,darknight-007/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,dagar/Firmware,dagar/Firmware,acfloria/Firmware,darknight-007/Firmware,Aerotenna/Firmware,dagar/Firmware,jlecoeur/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware