Ensure we are really setup before being connected

Change-Id: I42d9beeca159913a0eed5f9867c8ac0b191ffc3e

taskflow/jobs/backends/impl_zookeeper.py

@@ -351,6 +351,7 @@ class ZookeeperJobBoard(base.NotifyingJobBoard):
         self._job_base = k_paths.join(path, JOB_PREFIX)
         self._worker = None
         self._emit_notifications = bool(emit_notifications)
+        self._connected = False
 
     def _emit(self, state, details):
         # Submit the work to the executor to avoid blocking the kazoo queue.
@@ -715,7 +716,7 @@ class ZookeeperJobBoard(base.NotifyingJobBoard):
 
     @property
     def connected(self):
-        return self._client.connected
+        return self._connected and self._client.connected
 
     @lock_utils.locked(lock='_open_close_lock')
     def close(self):
@@ -729,6 +730,7 @@ class ZookeeperJobBoard(base.NotifyingJobBoard):
         with self._job_cond:
             self._known_jobs.clear()
         LOG.debug("Stopped & cleared local state")
+        self._connected = False
 
     @lock_utils.locked(lock='_open_close_lock')
     def connect(self, timeout=10.0):
@@ -763,6 +765,7 @@ class ZookeeperJobBoard(base.NotifyingJobBoard):
                     self.path,
                     func=self._on_job_posting,
                     allow_session_lost=True)
+            self._connected = True
         except excp.IncompatibleVersion:
             with excutils.save_and_reraise_exception():
                 try_clean()