Add HA specific config

This commit adds the basic configs for the work
so far on porting the HA model.

- adds galera class group
- adds enable_ha and user.scenerio and user.common
  to hierarchy
- move user to user.common
- adds the 13 role HA scenario
- adds global param overrides
- adds ha specific hiera defaults
- adds example user data
- adds scenario specific data mappings