Description of problem:

OpenStackSDK covers a good portion of service APIs to provision and manage the lifecycle of many OpenStack resources. Manila APIs to add/remove access rules to shares aren't supported at the moment. Adding these would allow services like Nova to not rely on the "manilaclient" SDK.

Version-Release number of selected component (if applicable): 18

Manila modules in OpenStackSDK: https://github.com/openstack/openstacksdk/tree/master/openstack/shared_file_system

Access Rules APIs in Manila's API reference:

"Allow Access": https://docs.openstack.org/api-ref/shared-file-system/?expanded=grant-access-detail#grant-access

"Deny Access": https://docs.openstack.org/api-ref/shared-file-system/?expanded=revoke-access-detail#revoke-access

"List Access Rules": https://docs.openstack.org/api-ref/shared-file-system/?expanded=list-share-access-rules-detail#list-share-access-rules

"Show Access Rule": https://docs.openstack.org/api-ref/shared-file-system/?expanded=describe-share-access-rule-detail#describe-share-access-rule