Merge pull request #99 from bodepd/move_common_user

move user data out of common.yaml
Merge pull request #98 from bodepd/move_global_config

update config.yaml, move most global config out
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 to hierarchy
- adds the 13 role HA scenario
- adds global param overrides
- adds ha specific hiera defaults
- adds example user data
- adds scenario specific data mappings