When creating Openstack VMs the user has to specify the image it wants
to use. sstream-mirror-glance adds a date to the image name, so they
always have to recheck which is the current latest image.
This commit adds the `set_latest_property` configuration to include
--set-latest-property to sstream-mirror-glance command line argument.
When --set-latest-property is given sstream-mirror-glance will set the
recently synced image with the `latest=true` property and then remove
the `latest` property from all the os_version/architecture matching
images.
Configure bundles to fetch simplestreams snap from edge channel
Closes-bug: #1933130
Change-Id: Idf78294db7abb8c81d637086e8142782bf1dd36f
Func-Test-PR: https://github.com/openstack-charmers/zaza-openstack-tests/pull/853
4754aca420