Remove python-PyMySQL from xena-testing
Remove python-PyMySQL from xena-testing

It's Newer version is available in c8-stream, so
we don't need to include in RDO repos, removing so
it's not included at time of xena-release prepare.

Already removed xena-testing tag in CBS for it.

Change-Id: I3b54a091e344fc714ee77b7821d652a8a62dfb80

redhat-openstack/rdoinfo