Switch to decorators.idempotent_id

test.idempotent_id is being kept temporary to migrate
to new lib interface. Now idempotent_id is available as Tempest stable
interface decorators and all plugins tests using the old decorator
should be switched to new interface.

In future, Once all plugins are switched to new decorator Tempest
will remove the test.idempotent_id

Change-Id: I6e24344a809ef397a252fe1fb002b2cad10cd5ba
Related-Bug: 1616913
diff --git a/cinder/tests/tempest/api/volume/test_consistencygroups.py b/cinder/tests/tempest/api/volume/test_consistencygroups.py
index c9850f0..d11770d 100644
--- a/cinder/tests/tempest/api/volume/test_consistencygroups.py
+++ b/cinder/tests/tempest/api/volume/test_consistencygroups.py
@@ -18,7 +18,7 @@
 from tempest.common import waiters
 from tempest import config
 from tempest.lib.common.utils import data_utils
-from tempest import test
+from tempest.lib import decorators
 
 from cinder.tests.tempest import cinder_clients
 
@@ -65,7 +65,7 @@
         self.consistencygroups_adm_client.wait_for_cgsnapshot_deletion(
             cgsnapshot_id)
 
-    @test.idempotent_id('3fe776ba-ec1f-4e6c-8d78-4b14c3a7fc44')
+    @decorators.idempotent_id('3fe776ba-ec1f-4e6c-8d78-4b14c3a7fc44')
     def test_consistencygroup_create_delete(self):
         # Create volume type
         name = data_utils.rand_name("volume-type")
@@ -109,7 +109,7 @@
         self._delete_consistencygroup(cg['id'])
         self.admin_volume_types_client.delete_volume_type(volume_type['id'])
 
-    @test.idempotent_id('2134dd52-f333-4456-bb05-6cb0f009a44f')
+    @decorators.idempotent_id('2134dd52-f333-4456-bb05-6cb0f009a44f')
     def test_consistencygroup_cgsnapshot_create_delete(self):
         # Create volume type
         name = data_utils.rand_name("volume-type")
@@ -169,7 +169,7 @@
         self._delete_consistencygroup(cg['id'])
         self.admin_volume_types_client.delete_volume_type(volume_type['id'])
 
-    @test.idempotent_id('3a6a5525-25ca-4a6c-aac4-cac6fa8f5b43')
+    @decorators.idempotent_id('3a6a5525-25ca-4a6c-aac4-cac6fa8f5b43')
     def test_create_consistencygroup_from_cgsnapshot(self):
         # Create volume type
         name = data_utils.rand_name("volume-type")
@@ -235,7 +235,7 @@
         self._delete_consistencygroup(cg['id'])
         self.admin_volume_types_client.delete_volume_type(volume_type['id'])
 
-    @test.idempotent_id('556121ae-de9c-4342-9897-e54260447a19')
+    @decorators.idempotent_id('556121ae-de9c-4342-9897-e54260447a19')
     def test_create_consistencygroup_from_consistencygroup(self):
         # Create volume type
         name = data_utils.rand_name("volume-type")