Remove normal API operation logs from API layer

At nova.osapi_compute.wsgi.server. normal API operation logs are
output as common way like:
  127.0.0.1 "PUT /v2.1/os-aggregates/10 HTTP/1.1" status: 200 len: 597
  time: 0.3027461

So it is not necessary to output the logs at each API layer like the
other APIs.
So this patch removes these logs from assisted_volume_snapshots.

Change-Id: I292e50d9e5626893dd28ab48a721e53cbf90362e

nova/api/openstack/compute/assisted_volume_snapshots.py

@@ -16,7 +16,6 @@
 
 """The Assisted volume snapshots extension."""
 
-from oslo_log import log as logging
 from oslo_serialization import jsonutils
 import six
 from webob import exc
@@ -27,10 +26,8 @@ from nova.api.openstack import wsgi
 from nova.api import validation
 from nova import compute
 from nova import exception
-from nova.i18n import _LI
 
 
-LOG = logging.getLogger(__name__)
 ALIAS = 'os-assisted-volume-snapshots'
 authorize = extensions.os_compute_authorizer(ALIAS)
 
@@ -53,8 +50,6 @@ class AssistedVolumeSnapshotsController(wsgi.Controller):
         create_info = snapshot['create_info']
         volume_id = snapshot['volume_id']
 
-        LOG.info(_LI("Create assisted snapshot from volume %s"), volume_id,
-                  context=context)
         try:
             return self.compute_api.volume_snapshot_create(context, volume_id,
                                                            create_info)
@@ -69,8 +64,6 @@ class AssistedVolumeSnapshotsController(wsgi.Controller):
         context = req.environ['nova.context']
         authorize(context, action='delete')
 
-        LOG.info(_LI("Delete snapshot with id: %s"), id, context=context)
-
         delete_metadata = {}
         delete_metadata.update(req.GET)