Comm integration testing

[jmmabanta]

• Updated imports in ex2_ground_station_software to handle integration in comm.py
• comm.py now uses groundStation.transaction() instead of receive() to transmit command to mimic the software's cli
  • Not sure if we need to keep libcsp (and keep a libcsp socket open) directly in comm.py as gs_software handles it already.
• comm.py can now be run with the same cli arguments as groundStation.py
  • eg. python3 comm.py -I uart -d /dev/ttyUSB0 (will add this to wiki once merged)
  • Note: Need to build libcsp in the submodule and need to run source ./env.sh for comm.py integration with gs_software to work