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 to hierarchy
- adds clientcert to hierarchy (to allow cert based
overrides to codify things like active/passive for
tests)
- adds the 13 role HA scenario
- adds ha specific hiera defaults
- adds example user data for 13 node scenario
- adds scenario specific data mappings
- add hiera data based on load_balancer certs names
to allow active/passive
- adds ha specific hiera global params
- adds additional role mappings for ha
Update README and common.yaml

README now includes simpler librarian-puppet-simple installation,
and references the fact that you may need to change your scenario.

Also, an update to common.yaml, and all_in_one.yaml for
more complete suppport of the all_in_one scenario
Fix README scripted install instructions

The /master branch path was missing in the raw URLs and
the parameters for the puppet agent run were confusing