Tools: Vagrant: modify test instructions to make copy of arudpilot

makes the compilations faster, and frees up the original directory for other things...

Vagrantfile

@@ -7,11 +7,14 @@
 # sim_vehicle.py --map --console # in the starting directory should start a Copter simulation
 # sim_vehicle.py --debug --gdb
 # sim_vehicle.py --debug --valgrind
-# time (cd /vagrant && ./waf configure --board=fmuv2 && ./waf build --target=bin/ardusub) # ~9 minutes
-# time (cd /vagrant && ./waf configure --board=fmuv3 && ./waf build --target=bin/ardusub) # ~ minutes (after building fmuv2)
-# time (cd /vagrant && ./waf configure --board=navio2 && ./waf build --target=bin/arduplane)
-# time (cd /vagrant && ./Tools/autotest/sim_vehicle.py --map --console -v ArduPlane -f jsbsim) # should test JSBSim
-# time (cd /vagrant && ./Tools/autotest/autotest.py build.Rover test.Rover)
+#
+# Make testing rather faster:
+# time rsync -aPH /vagrant/ $HOME/ardupilot  # real	8m13.712s
+# time (cd $HOME/ardupilot && ./waf configure --board=fmuv2 && ./waf build --target=bin/ardusub) # ~9 minutes
+# time (cd $HOME/ardupilot && ./waf configure --board=fmuv3 && ./waf build --target=bin/ardusub) # ~ minutes (after building fmuv2)
+# time (cd $HOME/ardupilot && ./waf configure --board=navio2 && ./waf build --target=bin/arduplane)
+# time (cd $HOME/ardupilot && ./Tools/autotest/sim_vehicle.py --map --console -v ArduPlane -f jsbsim) # should test JSBSim
+# time (cd $HOME/ardupilot && ./Tools/autotest/autotest.py build.Rover test.Rover)
 
 # Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
 VAGRANTFILE_API_VERSION = "2"