Identity Config - Role Tests Parity

1. Added an extensions-api admin (OS-KSADM) parameter to Identity Config.py
2. Needed OS-KSADM as a config parameter to list all roles.
3. Renamed sections and properties in config.py as per reviewer comments.
4. Removed extensions-api admin (OS-KSADM) parameter from congfig.py and reference.json.config.

Change-Id: I9d3f157fd32853f8f275736bf94575456d4f4bc6
Merge "Identity Config - Role Tests Parity"