Still a long way to go

Signed-off-by: Robert Breker <robert.breker@citrix.com>
Adding a utils file for common functions. Including one for grabbing a git repo when one doesn't exist locally (to avoid failure on re-run)

Signed-off-by: Rob Dobson <rob@rdobson.co.uk>
Merge branch 'clone_if_needed' of https://github.com/rdobson/build-tools into rdobson-clone_if_needed

Conflicts:
	build-and-install-cloudstack.sh
	install-cp.sh
	install-devcloud.sh
	install-xenserver.sh
	run-on-vm.sh