Sync rpc from oslo-incubator.

This includes the following changes:

 * use oslo.config directly
 * implementation of rpc-amqp-fast-reply-queue
 * simplifications to bin/nova-rpc-zmq-receiver
 * add new join_consumer_pool API call
 * a bug fix to ensure kombu messages get acked even when an exception
   occurs in the message callback

Change-Id: I813ce0ee7d5442d7b5b0f9d477949adabc83174e

bin/nova-rpc-zmq-receiver

@@ -22,9 +22,6 @@ import contextlib
 import os
 import sys
 
-from oslo.config import cfg
-import zmq
-
 # If ../nova/__init__.py exists, add ../ to Python search path, so that
 # it will override what happens to be installed in /usr/(local/)lib/python...
 POSSIBLE_TOPDIR = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
@@ -33,45 +30,22 @@ POSSIBLE_TOPDIR = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
 if os.path.exists(os.path.join(POSSIBLE_TOPDIR, 'nova', '__init__.py')):
     sys.path.insert(0, POSSIBLE_TOPDIR)
 
-from nova import config
+from oslo.config import cfg
-from nova import exception
+
 from nova.openstack.common import log as logging
 from nova.openstack.common import rpc
 from nova.openstack.common.rpc import impl_zmq
-from nova import utils
 
 CONF = cfg.CONF
 CONF.register_opts(rpc.rpc_opts)
 CONF.register_opts(impl_zmq.zmq_opts)
+CONF(sys.argv[1:], project='nova')
 
 
 def main():
-    config.parse_args(sys.argv)
     logging.setup("nova")
-    utils.monkey_patch()
-
-    ipc_dir = CONF.rpc_zmq_ipc_dir
-
-    # Create the necessary directories/files for this service.
-    if not os.path.isdir(ipc_dir):
-        try:
-            utils.execute('mkdir', '-p', ipc_dir, run_as_root=True)
-            utils.execute('chown', "%s:%s" % (os.getuid(), os.getgid()),
-                          ipc_dir, run_as_root=True)
-            utils.execute('chmod', '750', ipc_dir, run_as_root=True)
-        except exception.ProcessExecutionError:
-            logging.error(_("Could not create IPC socket directory."))
-            return
 
     with contextlib.closing(impl_zmq.ZmqProxy(CONF)) as reactor:
-        consume_in = "tcp://%s:%s" % \
-            (CONF.rpc_zmq_bind_address,
-             CONF.rpc_zmq_port)
-        consumption_proxy = impl_zmq.InternalContext(None)
-
-        reactor.register(consumption_proxy,
-                         consume_in, zmq.PULL, out_bind=True)
-
         reactor.consume_in_thread()
         reactor.wait()