Move remaining schema files into v2_1 directory

After removing v3 schemas, we have only 1 set of schemas for v2 (/v2.1)
APIs but those end up in scattered structure.

Schema files needs to be re arranged into a clean structure. Any
resource schema should be defined in single file for better readability.

This patch move remaining schema files into v2_1 directory and rename
some schemas according to their API.

Partially implements blueprint rearrange-nova-response-schemas

Change-Id: If07f0a929c7085090bcefd4d2d565b896bf438f3
diff --git a/tempest/services/compute/json/baremetal_nodes_client.py b/tempest/services/compute/json/baremetal_nodes_client.py
index fa2d7f4..d8f13c4 100644
--- a/tempest/services/compute/json/baremetal_nodes_client.py
+++ b/tempest/services/compute/json/baremetal_nodes_client.py
@@ -16,7 +16,8 @@
 
 from six.moves.urllib import parse as urllib
 
-from tempest.api_schema.response.compute import baremetal_nodes as schema
+from tempest.api_schema.response.compute.v2_1 import baremetal_nodes \
+    as schema
 from tempest.common import service_client