add access_key to share_access_map

For backends with internal authentication system,
e.g. Ceph, that return ``access_key`` (credential) for
client identities that are granted share access:

* Retrieve ``access_key`` as return value of driver's
  update_access()

* Store ``access_key`` in ShareAccessMapping model

* Expose it in access_list API

APIImpact

DocImpact

Partially implements bp auth-access-keys

Co-Authored-By: John Spray <jspray@redhat.com>

Change-Id: I486064f117cf3001dba7735ca92a7d89aee3ce5b
diff --git a/manila_tempest_tests/config.py b/manila_tempest_tests/config.py
index 58cf389..4203a71 100644
--- a/manila_tempest_tests/config.py
+++ b/manila_tempest_tests/config.py
@@ -34,7 +34,7 @@
                help="The minimum api microversion is configured to be the "
                     "value of the minimum microversion supported by Manila."),
     cfg.StrOpt("max_api_microversion",
-               default="2.20",
+               default="2.21",
                help="The maximum api microversion is configured to be the "
                     "value of the latest microversion supported by Manila."),
     cfg.StrOpt("region",