This updates the on-disk cache version to the same as the default
version in zuul-jobs from I0d5e1b567c364a9e6c7aa0b95de17abffaef0434
Note we have a pull request open on this original project to
incorporate these changes, but the project has been dormat for a long
time. If we don't have a response in the medium-term future, we can
bring this project into opendev.org git and maintain our enhancments
there.
Change-Id: I26b1a7d0dde12be7c493d44d754b9ea8f72e6e66
So that we can create dstat graphs at the end of devstack and other
jobs, cache the dstat_graph repository on our images.
dstat_graph is MIT licensed, but as far as I can tell, does not
have a release and is not packaged in Debian or Ubuntu.
Change-Id: I6cb0aa525dca0ee700d2d7548ccbb8d6af6ae92e