Add variables for active-passive Galera HA proxy

Add variables and data mappings needed to configure Galera HAProxy in an
active-passive model due to compatibility issues between Galera
configured with multiple active writers and certain SQL statements used
in OpenStack code.

Change-Id: I09111b406edf3799e01b7172956d08d84d40f526
Partial-Bug: #1321734
(cherry picked from commit ba8bdadd24e033df3d2feed9bcb383c6b4a28b04)

Conflicts:
	data/hiera_data/user.full_ha.yaml
Add variables for active-passive Galera HA proxy

Add variables needed to configure Galera HAProxy in an active-passive
model due to compatibility issues between Galera configured with
multiple active writers and certain SQL statements used in OpenStack
code.

Change-Id: Iab9693c3f8a223c0a8fe730de40602892f4460b6
Partial-Bug: #1321734
(cherry picked from commit fa9ac872614e6c535469e3d681e68ccca7e78e93)

Conflicts:
	data/hiera_data/user.compressed_ha.yaml
Merge pull request #100 from CiscoSystems/bugs/1321734

Add variables for active-passive Galera HA proxy