Fix the segment interval for pulling metadata (#3174)

The end of the interval would be on the truncated today date, which
means that you will exclude today. If your realtime ingestion job
runs shorter than a day, the metadata cannot be pulled from the
druid cluster.

superset/connectors/druid/models.py

@@ -492,7 +492,7 @@ def latest_metadata(self):
             lbound = datetime(1901, 1, 1).isoformat()[:10]
             rbound = datetime(2050, 1, 1).isoformat()[:10]
             if not self.version_higher(self.cluster.druid_version, '0.8.2'):
-                rbound = datetime.now().isoformat()[:10]
+                rbound = datetime.now().isoformat()
             try:
                 segment_metadata = client.segment_metadata(
                     datasource=self.datasource_name,