VOL-2311 Log task start and finish as info and warn

Helps when logging in INFO level, gives just enoug
context.

Also no longer log MDS updates or set-by-create updates
at info

Release 2.3.7

Change-Id: I22535c8b7a51c89778c6a9831139ddd802d95edc
diff --git a/VERSION b/VERSION
index c2417c3..00355e2 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.3.7-dev
+2.3.7
diff --git a/pyvoltha/adapters/extensions/omci/state_machines/mib_sync.py b/pyvoltha/adapters/extensions/omci/state_machines/mib_sync.py
index 919f921..f7f22fd 100644
--- a/pyvoltha/adapters/extensions/omci/state_machines/mib_sync.py
+++ b/pyvoltha/adapters/extensions/omci/state_machines/mib_sync.py
@@ -234,7 +234,7 @@
         if self._database is not None:
             self._database.save_mib_data_sync(self._device_id,
                                               self._mib_data_sync)
-            self.log.info("mds-updated", device=self._device_id, mds=self._mib_data_sync)
+            self.log.debug("mds-updated", device=self._device_id, mds=self._mib_data_sync)
 
     @property
     def last_mib_db_sync(self):
@@ -782,7 +782,7 @@
         if len(missing_attributes) and class_id in self._device.me_map:
             from pyvoltha.adapters.extensions.omci.tasks.omci_get_request import OmciGetRequest
 
-            self.log.info('update-sbc-items', class_id=class_id, entity_id=entity_id,
+            self.log.debug('update-sbc-items', class_id=class_id, entity_id=entity_id,
                           attributes=missing_attributes)
 
             def success(results):
diff --git a/pyvoltha/adapters/extensions/omci/tasks/task_runner.py b/pyvoltha/adapters/extensions/omci/tasks/task_runner.py
index 6175d3f..ccd8264 100644
--- a/pyvoltha/adapters/extensions/omci/tasks/task_runner.py
+++ b/pyvoltha/adapters/extensions/omci/tasks/task_runner.py
@@ -151,7 +151,7 @@
                         if len(queue) == 0:
                             del self._pending_queue[highest_priority]
 
-                        self.log.debug('starting-task', task=str(next_task),
+                        self.log.info('starting-task', task=str(next_task),
                                        running=len(self._running_queue),
                                        pending=len(self._pending_queue))
 
@@ -172,7 +172,7 @@
         :param task: (Task) The task that succeeded
         :return: deferred results
         """
-        self.log.debug('task-success', task_id=str(task),
+        self.log.info('task-success', task_id=str(task),
                        running=len(self._running_queue),
                        pending=len(self._pending_queue))
         try:
@@ -200,7 +200,7 @@
         """
         from pyvoltha.adapters.extensions.omci.tasks.task import WatchdogTimeoutFailure
 
-        self.log.debug('task-failure', task_id=str(task),
+        self.log.warn('task-failure', task_id=str(task),
                        running=len(self._running_queue),
                        pending=len(self._pending_queue))
         try: