Nodepool's devstack image cacher was redownloading every image one time
per devstack branch. We only need to download the image once if the
image name doesn't change.
Change-Id: Ib1910c34b8479ebad740a915fcc9297205cbe387
Since devstack-gate no longer relies on the workspace-cache
directory, this is an unnecessary waste of effort.
Change-Id: Ic9ef8b269d0184f5891d355901bbfb29f7273670
Cache all review.openstack.org git repos in /opt/git.
Subsequent changes to gerrit-git-prep and devstack-gate will make
use of these repos (eventually deprecating the devstack-gate repos
is ~jenkins/workspace-cache).
Refactor the devstack cache python script a bit to make common
functions reusable. Also rename it because underscores are better
than hyphens for python file names.
Change-Id: I4ae40613ebcca62b0dfc2eaba159557a4c71a529
