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 Neutron, Nova,
Octavia project and Openvswitch as well.
Change-Id: I04d3a17231b607795bbddb85cd940fa725ff7a61
Implements: blueprint mixing-binary-and-source-image
