Fix bug: gpconfig change gp_resource_manager fail
Fix bug: gpconfig change gp_resource_manager fail

The quote_string function will make sure that the value(if type is string) is
enclosed by `'`. This is introduced in previous commit(f936c4f). We need
to make the change of gp_resource_manager meet the logic now.
kaknikhil/gpdb,edespino/gpdb,xinzweb/gpdb,jmcatamney/gpdb,lisakowen/gpdb,janebeckman/gpdb,lisakowen/gpdb,greenplum-db/gpdb,kaknikhil/gpdb,50wu/gpdb,ashwinstar/gpdb,xinzweb/gpdb,adam8157/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,janebeckman/gpdb,edespino/gpdb,Chibin/gpdb,adam8157/gpdb,lisakowen/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,Chibin/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,adam8157/gpdb,ashwinstar/gpdb,edespino/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,Chibin/gpdb,edespino/gpdb,janebeckman/gpdb,adam8157/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,adam8157/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,50wu/gpdb,janebeckman/gpdb,kaknikhil/gpdb,janebeckman/gpdb,yuanzhao/gpdb,xinzweb/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,xinzweb/gpdb,edespino/gpdb,50wu/gpdb,cjcjameson/gpdb,xinzweb/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,janebeckman/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,lisakowen/gpdb,edespino/gpdb,Chibin/gpdb,edespino/gpdb,edespino/gpdb,xinzweb/gpdb,ashwinstar/gpdb,lisakowen/gpdb,Chibin/gpdb,janebeckman/gpdb,edespino/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,janebeckman/gpdb,xinzweb/gpdb,50wu/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,50wu/gpdb,Chibin/gpdb,adam8157/gpdb,50wu/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,lisakowen/gpdb,lisakowen/gpdb,janebeckman/gpdb,Chibin/gpdb,jmcatamney/gpdb,janebeckman/gpdb,ashwinstar/gpdb,lisakowen/gpdb,50wu/gpdb,kaknikhil/gpdb,edespino/gpdb,jmcatamney/gpdb,xinzweb/gpdb,cjcjameson/gpdb,Chibin/gpdb,greenplum-db/gpdb,Chibin/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,50wu/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,Chibin/gpdb,adam8157/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,adam8157/gpdb,ashwinstar/gpdb