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
Tenants API Tenant Model - Tests Parity.

1. Refactored the tenant model and test as per tenant tests parity requirements.

Change-Id: I32d60759ab01bafb3e582e8f891f2a5030ec9b03
Refactored object storage account and container list models

Change-Id: Ib3a7a964f64d90289355eec17ae3c8ad39cde50d
Merge "Tenants API Tenant Model - Tests Parity."
Merge "Identity Config - Role Tests Parity"
Merge "Refactored object storage account and container list models"