FOGL-3502: fix for start parameter in buckets query (#1784)
FOGL-3502: fix for start parameter in buckets query (#1784)

FOGL-3502: fix for start parameter in buckets query
Use UTC time for start parameter
Added changes for start parameter to asset_readings_with_bucket_size

foglamp/FogLAMP,foglamp/FogLAMP,foglamp/FogLAMP,foglamp/FogLAMP