Add api_v2_admin flag

Only run Identity V2 admin tests if the identity v2 admin API is
available. The new config flag is set to True by default.

Change-Id: I43459cb1a96e725dde41e23962e367dbdc345686

releasenotes/notes/api_v2_admin_flag-dea5ca9bc2ce63bc.yaml

@@ -0,0 +1,7 @@
+---
+features:
+  - |
+    A new configuration flag api_v2_admin is introduced in the identity
+    feature flag group to allow for enabling/disabling all identity v2
+    admin tests. The new flag only applies when the existing api_v2 flag
+    is set to True

tempest/api/identity/base.py

@@ -126,6 +126,12 @@ class BaseIdentityV2AdminTest(BaseIdentityV2Test):
     # executed, so this will not impact the ability to execute tests.
     force_tenant_isolation = True
 
+    @classmethod
+    def skip_checks(cls):
+        super(BaseIdentityV2AdminTest, cls).skip_checks()
+        if not CONF.identity_feature_enabled.api_v2_admin:
+            raise cls.skipException('Identity v2 admin not available')
+
     @classmethod
     def setup_clients(cls):
         super(BaseIdentityV2AdminTest, cls).setup_clients()

tempest/config.py

@@ -208,6 +208,10 @@ IdentityFeatureGroup = [
     cfg.BoolOpt('api_v2',
                 default=True,
                 help='Is the v2 identity API enabled'),
+    cfg.BoolOpt('api_v2_admin',
+                default=True,
+                help="Is the v2 identity admin API available? This setting "
+                     "only applies if api_v2 is set to True."),
     cfg.BoolOpt('api_v3',
                 default=True,
                 help='Is the v3 identity API enabled'),