Port types and extra specs to volume api

* Fixes bug 979089
 * Adds pollicy for new extensions
 * Fixes __init__ in testing directories
 * Cleans up existing volume types tests
 * Adds tests for type management
 * Adds tests for extra specs management
 * Removed unused Quota handling
 * Fixed typo in db volume_type_get

Change-Id: Ic80190ecf1d6d6ad0229e5af642a50c7c53bbbf9

nova/tests/policy.json

@@ -116,7 +116,6 @@
     "compute_extension:zones": [],
 
 
-
     "volume:create": [],
     "volume:get": [],
     "volume:get_all": [],
@@ -125,7 +124,6 @@
     "volume:update": [],
     "volume:delete_volume_metadata": [],
     "volume:update_volume_metadata": [],
-
     "volume:attach": [],
     "volume:detach": [],
     "volume:reserve_volume": [],
@@ -134,13 +132,16 @@
     "volume:check_detach": [],
     "volume:initialize_connection": [],
     "volume:terminate_connection": [],
-
     "volume:create_snapshot": [],
     "volume:delete_snapshot": [],
     "volume:get_snapshot": [],
     "volume:get_all_snapshots": [],
 
 
+    "volume_extension:types_manage": [],
+    "volume_extension:types_extra_specs": [],
+
+
     "network:get_all_networks": [],
     "network:get_network": [],
     "network:delete_network": [],