ZMQ: Allow to raise remote exception

This patch adds possibility to re-raise on client's side exception, that
was raised on server side - serialize it on server side, restore and
re-raise on client.
Allowed to pass `allowed_remote_exmods` parameter from impl_zmq to
CallRequest class

Functional test CallTestCase.test_exception() passes now, so added it to
tox.ini. Modified zmq_receiver to be able run functional tests.

Change-Id: Ic055f3574962f3e80a0528d5d99320386303634e

oslo_messaging/_drivers/impl_zmq.py

@@ -71,6 +71,11 @@ zmq_opts = [
                default=30,
                help='Seconds to wait before a cast expires (TTL). '
                     'Only supported by impl_zmq.'),
+
+    cfg.IntOpt('rpc_poll_timeout',
+               default=1,
+               help='The default number of seconds that poll should wait. '
+                    'Poll raises timeout exception when timeout expired.'),
 ]
 
 
@@ -95,7 +100,8 @@ class ZmqDriver(base.BaseDriver):
     def send(self, target, ctxt, message, wait_for_reply=None, timeout=None,
              retry=None):
         if self.client is None:
-            self.client = zmq_client.ZmqClient(self.conf, self.matchmaker)
+            self.client = zmq_client.ZmqClient(self.conf, self.matchmaker,
+                                               self._allowed_remote_exmods)
         if wait_for_reply:
             return self.client.call(target, ctxt, message, timeout, retry)
         else: