Support local rover build

[lolorol]

To support local development of the rover:

git clone https://github.com/aztfmod/rover.git /tf/caf/rover

# set the rover to the local clone
alias rover=/tf/caf/rover/scripts/rover.sh
export ROVER_RUNNER=true

You can now make local changes to the rover and test the changes
make sure the folder /tf/caf/rover is in the .gitignore