External inventory repo support adds a lot of baggage to project scope.
The new workflow is a bit simpler:
External commands:
git clone fuel-ccp-installer
git clone inventory_repo inventory
run kargo_deploy.sh
Behavior is now reverted in that if inventory/ dir exists, it will not
overwrite default file contents. However, if CUSTOM_YAML is specified,
it will overwrite data.
Change-Id: I9557cf86972a64ba0e72aa86111f598be66caff3
7be422c171