Update stemcell default to 2611 [finishes #73909924]
Remove unused default in cf-mysql-template [finishes #73759478]
Update maria-galera src to 10.0.12

[#73057552]
Update my.cnf

- Change SST method to rsync
- Change node names to mysql/<node-#> for readability
Bigger compilation VMs for vsphere
Bump src/cf-mysql-broker

Bump cloudfoundry/cf-mysql-broker:
  Alex Stupakov and Lionel Honda:
     removed unused includes from feature_helper.rb ( Travis Success: https://travis-ci.org/cloudfoundry/cf-mysql-broker/builds/29094289 )
Use bundled libpcre instead of system pcre