This commit completly drops support for Yum as a depsolving/repoclosure
backend.
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
(cherry picked from commit f5702e4c9d0d5d9d31421d3d47200581e41f02bf)
Move repoclosure out from test phase into its own phase and
run parallel with image building phases(osbs, imagebuild, ...)
to speed things up.
JIRA: RHELCMP-8
Signed-off-by: Haibo Lin <hlin@redhat.com>