Verify correct mode for segwalrep script.
Verify correct mode for segwalrep script.

It also output the segment configuration at the end.

Author: Xin Zhang <80ac6425c128040c27b3c6077c824bc26222f5e7@pivotal.io>
Author: Ashwin Agrawal <924bf3437ad315c1c74f9c41d83153600b05f548@pivotal.io>

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