Following changes are done with this patch:-
- Ussuri+ releases are CentOS8 only, switch the standalone
environment settings to reflect the same.
- Add some os tempest options in standalone environment
file to get tempest run with it.
- Enable repo setup on virthost it will be needed to get
repos needed by DLRN run.
- Add settings to not prepare overcloud nodes as standalone
deploy doesn't need those.
- Also add some vars required for standalone deployment.
- Do not use egg_info for tripleo-quickstart-extras path to
avoid quickstart-extras installation from pip cache and instead
install it from specified path.
This environment file will be used to test standalone
deployments on ci.centos.org.
Closes-Bug: #1889219
Depends-On: I87a0214a344a9b23dd267e412a37b2abe0eb0571
Change-Id: Ic17bf6e69b1620bdcca339f436e1399b29c0437e