just prepared to allow ship user configfiles literally
Changed default settings in the my.cnf template (ok its names galera)
So you can use the M and G on commandline.
Means ansible-playbook  .... --extra-vars="innodb_buffer_pool_size=128M"
instead of
ansible-playbook  .... --extra-vars="innodb_buffer_pool_size_mb=128"
we got wsrep_slave_threads 2x. solved
changed template name for /etc/mysql/my.cnf from galera.j2 to my.cnf.j2
User can deploy there configdata by providing files instead
of using Optoins
Howto added
Merged galera_vars.yaml, mysql_vars.yaml sysbench_vars.yaml into config_vars.yaml
Some cleaning
Added Play to check variables (gcomm)

g Change ta be committed: