Run worker-based engine tests faster

This change reduces polling intervals for transport and proxy
from default 1 second to 0.01 second. On my machine this reduces
time needed to run WorkerBasedEngineTest almost 5 times, which,
in turn, makes testr almost twice faster.

Change-Id: I8dfe08c06234f33e838059b2f8d9d6a7c7819e06

taskflow/engines/worker_based/proxy.py

@@ -44,6 +44,12 @@ class Proxy(object):
         self._transport = kwargs.get('transport')
         self._transport_opts = kwargs.get('transport_options')
 
+        self._drain_events_timeout = DRAIN_EVENTS_PERIOD
+        if self._transport == 'memory' and self._transport_opts:
+            polling_interval = self._transport_opts.get('polling_interval')
+            if polling_interval:
+                self._drain_events_timeout = polling_interval
+
         # create connection
         self._conn = kombu.Connection(self._url, transport=self._transport,
                                       transport_options=self._transport_opts)
@@ -95,7 +101,7 @@ class Proxy(object):
                 self._running.set()
                 while self.is_running:
                     try:
-                        conn.drain_events(timeout=DRAIN_EVENTS_PERIOD)
+                        conn.drain_events(timeout=self._drain_events_timeout)
                     except socket.timeout:
                         pass
                     if self._on_wait is not None:

taskflow/tests/unit/test_action_engine.py

@@ -587,6 +587,9 @@ class WorkerBasedEngineTest(EngineTaskTest,
                 'taskflow.tests.utils',
             ],
             'transport': self.transport,
+            'transport_options': {
+                'polling_interval': 0.01
+            }
         }
         self.worker = wkr.Worker(**worker_conf)
         self.worker_thread = threading.Thread(target=self.worker.run)