change sleep time to 60sec for the metadata retrieval

Author: Helene

source/messages.py

@@ -42,7 +42,7 @@
        'InconsistentParams': 'Received parameters {} inconsistent with request parameters {}',
        'SensorDisabled': 'Sensor for metric {} is disabled',
        'NoData': 'Empty results received',  # Please check the pmcollector is properly configured and running.
-       'NoDataStartNextAttempt': 'No Metadata results received from the pmcollector. Start retry attempt {} in 5s (MAX_ATTEMPTS_COUNT:{})',
+       'NoDataStartNextAttempt': 'No Metadata results received from the pmcollector. Start retry attempt {} in 60s (MAX_ATTEMPTS_COUNT:{})',
        'BucketsizeChange': 'Based on requested downsample value: {} the bucketsize will be set: {}',
        'BucketsizeToPeriod': 'Bucketsize will be set to sensors period: {}',
        'ReceivedQuery': 'Received query request for query:{}, start:{}, end:{}',

source/zimonGrafanaIntf.py

@@ -89,7 +89,7 @@ def __initializeTables(self):
                     break
                 # if no data returned because of the REST HTTP server is still starting, sleep and retry (max 3 times)
                 self.logger.warning(MSG['NoDataStartNextAttempt'].format(attempt, MAX_ATTEMPTS_COUNT))
-                sleep(30)
+                sleep(60)
             else:
                 foundItems = len(self.metaData.allParents) - 1
                 sensors = self.metaData.sensorsSpec.keys()