Add gallera endpoint_username and endpoint_password.
Add gallera endpoint_username and endpoint_password.

Also fixed variable naming convention to reflect proper depth in the
yaml.

[#129015079]

Signed-off-by: Steve Taylor <2618d8eeb38db5666975df4fd945cc4512e3f384@pivotal.io>

cloudfoundry/cf-deployment,cloudfoundry/cf-deployment,emalm/cf-deployment