In gp_replica_check, wait for checkpoint to finish.
In gp_replica_check, wait for checkpoint to finish.

I removed the CHECKPOINT calls from the python script yesterday, replacing
them with RequestCheckpoint() in the UDF itself. But I didn't use the
CHECKPOINT_WAIT flag, so it might go ahead with the checking before the
checkpoint has run. That might explain the gp_replica_check failures we're
seeing in the pipeline now.

adam8157/gpdb,adam8157/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,xinzweb/gpdb,Chibin/gpdb,Chibin/gpdb,greenplum-db/gpdb,50wu/gpdb,xinzweb/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,xinzweb/gpdb,Chibin/gpdb,greenplum-db/gpdb,lisakowen/gpdb,50wu/gpdb,50wu/gpdb,50wu/gpdb,Chibin/gpdb,greenplum-db/gpdb,50wu/gpdb,lisakowen/gpdb,Chibin/gpdb,jmcatamney/gpdb,lisakowen/gpdb,jmcatamney/gpdb,adam8157/gpdb,adam8157/gpdb,Chibin/gpdb,adam8157/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,adam8157/gpdb,Chibin/gpdb,50wu/gpdb,xinzweb/gpdb,adam8157/gpdb,jmcatamney/gpdb,Chibin/gpdb,xinzweb/gpdb,Chibin/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,xinzweb/gpdb,lisakowen/gpdb,ashwinstar/gpdb,50wu/gpdb,lisakowen/gpdb,ashwinstar/gpdb,50wu/gpdb,jmcatamney/gpdb,adam8157/gpdb,lisakowen/gpdb,xinzweb/gpdb,jmcatamney/gpdb,lisakowen/gpdb,greenplum-db/gpdb,xinzweb/gpdb,lisakowen/gpdb,Chibin/gpdb,greenplum-db/gpdb,ashwinstar/gpdb