This adds new variables to the 005-clone-dependencies script in
Airskiff to be able to turn off cloning for the Airship repositories.
The intended use case of this is so the Airskiff gate can avoid cloning
the repository it is currently testing.
Change-Id: I629ce9373b1b68f7e5fb6b134d9ea063a344a70c
c78975c8c9