Fix masking of sequence values for consistency checks
Fix masking of sequence values for consistency checks

SEQ_LOG_VALS are pre-logged to avoid logging every fetch from a
sequence, so we need to mask out last_value and log_cnt for sequence
pages before running consistency checks.

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