Remove obsolete upgrade-handling code.
Remove obsolete upgrade-handling code.

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