RPC worker support for pecan server

This patch adds support for launching the RPC worker processes
when using the simple wsgi server for pecan.

Change-Id: I7274083c32fd57133f8b33241c5fa95a8bb9bbb3
Partially-Implements: wsgi-pecan-switch

neutron/server/wsgi_pecan.py

@@ -21,6 +21,7 @@ from six.moves import socketserver
 from neutron._i18n import _LI, _LW
 from neutron.common import rpc as n_rpc
 from neutron.pecan_wsgi import app as pecan_app
+from neutron import service
 
 LOG = log.getLogger(__name__)
 
@@ -32,9 +33,11 @@ class ThreadedSimpleServer(socketserver.ThreadingMixIn,
 
 def pecan_wsgi_server():
     LOG.info(_LI("Pecan WSGI server starting..."))
+    application = pecan_app.setup_app()
+    # this launches RPC workers in separate processes
+    service.serve_rpc()
     # No AMQP connection should be created within this process
     n_rpc.RPC_DISABLED = True
-    application = pecan_app.setup_app()
 
     host = cfg.CONF.bind_host
     port = cfg.CONF.bind_port