Merge pull request #2737 from jlsherrill/comps_update

comps updates for upcoming changes
release-version-cache - ajax fetch of release versions in headpin mode

release-version-cache - fence katello-only spec tests

release-version-cache - moved releases call to ui controller instead of api
Merge pull request #2734 from thomasmckay/release-version-cache

release-version-cache - ajax fetch of release versions in headpin mode
Supporting yum_clone_distributor in pulp

This assigns 2 distributors to all repos, a yum_distributor
and a yum_clone_distributor.  This way we can call the yum_clone_distributor
in some cases when we know we are cloning a repository.  This really
is only the case in content view promotion.
updating spec for katello-pulp-plugins
fixing test looking for distributors
small formatting fix
cassette update