In case Kolla's users want to deploy with both of
binary and source image, we should have a variable
install type that define install type for each project.
We also add specific image tag for each Openstack project.
This commit is implemented for Sahara, Searchlight,
Senlin, Solum and Swift projects.
Change-Id: I964796b2f9e3eae69d7eccf68e9428ce9390010c
Implements: blueprint mixing-binary-and-source-image
