Deprecate cinder_* configuration settings

Create a new section in the configuration file called 'cinder'.
Move all of the cinder_* configuration settings to this section.

DocImpact

The table below has the changes:

+---------------------------------+----------------------------+
| 'DEFAULT' Section               | 'cinder' Section           |
|---------------------------------|----------------------------|
| cinder_catalog_info             | catalog_info               |
| cinder_endpoint_template        | endpoint_template          |
| os_region_name                  | os_region_name             |
| cinder_ca_certificates_file     | ca_certificates_file       |
| cinder_http_retries             | http_retries               |
| cinder_http_timeout             | http_timeout               |
| cinder_api_insecure             | api_insecure               |
| cinder_cross_az_attach          | cross_az_attach            |
+---------------------------------+----------------------------+

UpgradeImpact
The changes are backward compatible.

Change-Id: Ie6b3f9d60b5e149375ff3039be444538f5f50756
Merge "Deprecate cinder_* configuration settings"