gp_replica_check: cosmetic changes to output
gp_replica_check: cosmetic changes to output

Added code to print thread id for passed or failed status to easily
correlate the message result with the data directory. Some minor
formatting along the way.

greenplum-db/gpdb,50wu/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,50wu/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,50wu/gpdb,50wu/gpdb,greenplum-db/gpdb,50wu/gpdb,greenplum-db/gpdb,50wu/gpdb,50wu/gpdb,greenplum-db/gpdb,50wu/gpdb