* Remove old cgroupsv2 test
* Consolidate install test clauses into functions
* Unpin vagrant-k3s plugin version, run latest
* Add ubuntu-2204 as install test, remove ubuntu-focal
* Update nightly install matrix
* Move to Leap 15.5
* Consolidate vagrant box caching key to improve cache hits on all VM testing
Signed-off-by: Derek Nola <derek.nola@suse.com>