Rename SUSE vars file and remove mysql-python

The SUSE builds are failing due to a change in the galera_client
role causing the trove role's vars file to be found before the
galera_client vars file. We therefore rename the trove vars file
for SUSE. This also makes transitions between versions easier.

The mysql-python package is no longer maintained. We are using
pymysql instead, so this package does not need to be installed.
This resolves current build failures due to the mysql-python
package not being installable due to the new version of MariaDB
being used.

Depends-On: https://review.openstack.org/602924
Change-Id: Iaee84e8cec7c19d306924adf3743e03da6fa6b4f

defaults/main.yml

@@ -227,7 +227,6 @@ trove_glance_images: []
 
 trove_pip_packages:
   - cryptography
-  - MySQL-python
   - os-client-config
   - osprofiler
   - pexpect