Added tunings and moved code into relevant files

The following tunings have been made: 
*innodb_buffer_pool_size will now be set to 70% of the VM's total memory. 
*max connections has been set to be 100 * the number of vcpus the VM has
*gcache size is 200MB for VMs that have under 2GB of memory, and 1GB for VMs with more than 2GB
*SST method has been changed from rsync to xtrabackup
*wsrep_slave_threads has been explicitly set to the number of vcpus the VM has. 

In addition to the tunings, some code in the init.sls file has been moved to their own separate state files to help with orchestration. 

-Alex