[WORKER] Remove unused stats_client.py file

This code was originally used to start a new thread that polled
the worker for statistics. This is gathered via the STATS message
now, so this is unused code.

Change-Id: I1cc7a1af1717f910308ac83967c21df1f705d8f8

libra/worker/stats_client.py

@@ -1,55 +0,0 @@
-# Copyright 2012 Hewlett-Packard Development Company, L.P.
-#
-# Licensed under the Apache License, Version 2.0 (the "License"); you may
-# not use this file except in compliance with the License. You may obtain
-# a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations
-# under the License.
-
-import eventlet
-
-from libra.common.exc import ServiceUnavailable
-from libra.openstack.common import log
-
-LOG = log.getLogger(__name__)
-
-
-def record_stats(http_stats, tcp_stats):
-    """ Permanently record load balancer statistics. """
-    LOG.debug("HTTP bytes in/out: (%d, %d)" %
-              http_stats.bytes_in, http_stats.bytes_out)
-    LOG.debug("[TCP bytes in/out: (%d, %d)" %
-              tcp_stats.bytes_in, tcp_stats.bytes_out)
-
-
-def stats_thread(driver, stats_poll):
-    """ Statistics thread function. """
-    LOG.debug("Statistics gathering process started.")
-    LOG.debug("Polling interval: %d", stats_poll)
-
-    while True:
-        try:
-            http_stats = driver.get_stats('http')
-            tcp_stats = driver.get_stats('tcp')
-        except NotImplementedError:
-            LOG.critical(
-                "Driver does not implement statisics gathering."
-            )
-            break
-        except ServiceUnavailable:
-            LOG.warn("Unable to get statistics at this time.")
-        except Exception as e:
-            LOG.critical("Exception: %s, %s" % (e.__class__, e))
-            break
-        else:
-            record_stats(http_stats, tcp_stats)
-
-        eventlet.sleep(stats_poll)
-
-    LOG.info("Statistics gathering process terminated.")