Can avoid invalid table drop with refreshing tables

Author: jeeminso

tests/bwc/test_rolling_upgrade.py

@@ -305,6 +305,10 @@ def num_docs_rx(cursor):
                 if int(path.from_version.split('.')[0]) >= 5 and int(path.from_version.split('.')[1]) >= 10:
                     with connect(replica_cluster.node().http_url, error_trace=True) as replica_conn:
                         rc = replica_conn.cursor()
+                        c.execute("refresh table doc.x")
+                        c.execute("refresh table doc.rx")
+                        rc.execute("refresh table doc.x")
+                        rc.execute("refresh table doc.rx")
 
                         # Cannot drop replicated tables
                         with self.assertRaises(ProgrammingError):