resgroup: add rolresgroup to pg_roles.
resgroup: add rolresgroup to pg_roles.

rolresgroup was added to pg_authid in previous commits, we also should
add it to pg_authid.

Signed-off-by: Ning Yu <1ef20c7bf83cc456c790d6afa040b63811531869@pivotal.io>

janebeckman/gpdb,rvs/gpdb,50wu/gpdb,adam8157/gpdb,Chibin/gpdb,adam8157/gpdb,rvs/gpdb,ashwinstar/gpdb,Chibin/gpdb,Quikling/gpdb,jmcatamney/gpdb,rvs/gpdb,adam8157/gpdb,janebeckman/gpdb,edespino/gpdb,edespino/gpdb,janebeckman/gpdb,rvs/gpdb,yuanzhao/gpdb,janebeckman/gpdb,Quikling/gpdb,Quikling/gpdb,ashwinstar/gpdb,Chibin/gpdb,Chibin/gpdb,greenplum-db/gpdb,adam8157/gpdb,yuanzhao/gpdb,xinzweb/gpdb,xinzweb/gpdb,kaknikhil/gpdb,edespino/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,50wu/gpdb,edespino/gpdb,cjcjameson/gpdb,xinzweb/gpdb,rvs/gpdb,lisakowen/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,Chibin/gpdb,Chibin/gpdb,50wu/gpdb,lisakowen/gpdb,janebeckman/gpdb,Chibin/gpdb,50wu/gpdb,lisakowen/gpdb,jmcatamney/gpdb,edespino/gpdb,edespino/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,Quikling/gpdb,edespino/gpdb,cjcjameson/gpdb,lisakowen/gpdb,cjcjameson/gpdb,janebeckman/gpdb,rvs/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,kaknikhil/gpdb,janebeckman/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,Quikling/gpdb,rvs/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,janebeckman/gpdb,janebeckman/gpdb,edespino/gpdb,Chibin/gpdb,lisakowen/gpdb,50wu/gpdb,kaknikhil/gpdb,Quikling/gpdb,xinzweb/gpdb,janebeckman/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,Quikling/gpdb,xinzweb/gpdb,Chibin/gpdb,adam8157/gpdb,xinzweb/gpdb,ashwinstar/gpdb,xinzweb/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,adam8157/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,50wu/gpdb,50wu/gpdb,kaknikhil/gpdb,rvs/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,edespino/gpdb,ashwinstar/gpdb,xinzweb/gpdb,kaknikhil/gpdb,lisakowen/gpdb,edespino/gpdb,Quikling/gpdb,lisakowen/gpdb,Chibin/gpdb,greenplum-db/gpdb,adam8157/gpdb,rvs/gpdb,jmcatamney/gpdb,adam8157/gpdb,Quikling/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,50wu/gpdb,ashwinstar/gpdb,rvs/gpdb,lisakowen/gpdb,jmcatamney/gpdb,Quikling/gpdb,kaknikhil/gpdb,yuanzhao/gpdb