Add Debug Logging Support

Previsouly the openstack::keystone class would use the
verbose parameter for debug logging.

This change adds the debug parameter that allows users to
seperate debug and verbose logging levels.

Defaults to 'False' for backwards compatibility and to disable
debug logging.

Change-Id: Icd00233d00bec71bac15fe58c0edf6f47f9c32a7
Merge "Add Debug Logging Support"