Update pg_upgrade for 7.3.
Update pg_upgrade for 7.3.

oberstet/postgres-xl,rubikloud/gpdb,50wu/gpdb,zaksoup/gpdb,pavanvd/postgres-xl,janebeckman/gpdb,rubikloud/gpdb,lpetrov-pivotal/gpdb,janebeckman/gpdb,Quikling/gpdb,royc1/gpdb,xinzweb/gpdb,edespino/gpdb,techdragon/Postgres-XL,tangp3/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,ahachete/gpdb,edespino/gpdb,0x0FFF/gpdb,cjcjameson/gpdb,xinzweb/gpdb,Quikling/gpdb,atris/gpdb,royc1/gpdb,arcivanov/postgres-xl,foyzur/gpdb,snaga/postgres-xl,ovr/postgres-xl,randomtask1155/gpdb,CraigHarris/gpdb,lpetrov-pivotal/gpdb,chrishajas/gpdb,Chibin/gpdb,ovr/postgres-xl,kmjungersen/PostgresXL,xinzweb/gpdb,yuanzhao/gpdb,ovr/postgres-xl,edespino/gpdb,xuegang/gpdb,adam8157/gpdb,tangp3/gpdb,yuanzhao/gpdb,zaksoup/gpdb,randomtask1155/gpdb,rvs/gpdb,ahachete/gpdb,kaknikhil/gpdb,lintzc/gpdb,yuanzhao/gpdb,janebeckman/gpdb,lintzc/gpdb,techdragon/Postgres-XL,yazun/postgres-xl,tpostgres-projects/tPostgres,kmjungersen/PostgresXL,tangp3/gpdb,Chibin/gpdb,yuanzhao/gpdb,foyzur/gpdb,xinzweb/gpdb,lintzc/gpdb,lintzc/gpdb,lintzc/gpdb,postmind-net/postgres-xl,janebeckman/gpdb,edespino/gpdb,arcivanov/postgres-xl,royc1/gpdb,xuegang/gpdb,cjcjameson/gpdb,Postgres-XL/Postgres-XL,50wu/gpdb,Chibin/gpdb,cjcjameson/gpdb,Quikling/gpdb,ahachete/gpdb,lisakowen/gpdb,ashwinstar/gpdb,CraigHarris/gpdb,xuegang/gpdb,adam8157/gpdb,tpostgres-projects/tPostgres,50wu/gpdb,50wu/gpdb,tpostgres-projects/tPostgres,atris/gpdb,lintzc/gpdb,randomtask1155/gpdb,janebeckman/gpdb,lintzc/gpdb,adam8157/gpdb,0x0FFF/gpdb,kmjungersen/PostgresXL,janebeckman/gpdb,kaknikhil/gpdb,zaksoup/gpdb,chrishajas/gpdb,lpetrov-pivotal/gpdb,cjcjameson/gpdb,Postgres-XL/Postgres-XL,rubikloud/gpdb,snaga/postgres-xl,ashwinstar/gpdb,Quikling/gpdb,postmind-net/postgres-xl,chrishajas/gpdb,0x0FFF/gpdb,adam8157/gpdb,greenplum-db/gpdb,xuegang/gpdb,chrishajas/gpdb,CraigHarris/gpdb,edespino/gpdb,randomtask1155/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,rubikloud/gpdb,foyzur/gpdb,adam8157/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,randomtask1155/gpdb,techdragon/Postgres-XL,cjcjameson/gpdb,postmind-net/postgres-xl,tangp3/gpdb,zaksoup/gpdb,janebeckman/gpdb,lisakowen/gpdb,Chibin/gpdb,rvs/gpdb,techdragon/Postgres-XL,postmind-net/postgres-xl,CraigHarris/gpdb,50wu/gpdb,kaknikhil/gpdb,adam8157/gpdb,rvs/gpdb,janebeckman/gpdb,50wu/gpdb,Quikling/gpdb,greenplum-db/gpdb,lisakowen/gpdb,janebeckman/gpdb,atris/gpdb,Chibin/gpdb,adam8157/gpdb,royc1/gpdb,atris/gpdb,ashwinstar/gpdb,rubikloud/gpdb,zaksoup/gpdb,kmjungersen/PostgresXL,atris/gpdb,cjcjameson/gpdb,foyzur/gpdb,snaga/postgres-xl,postmind-net/postgres-xl,tpostgres-projects/tPostgres,lisakowen/gpdb,tpostgres-projects/tPostgres,xuegang/gpdb,ahachete/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,ovr/postgres-xl,lintzc/gpdb,50wu/gpdb,ahachete/gpdb,tangp3/gpdb,Quikling/gpdb,lpetrov-pivotal/gpdb,jmcatamney/gpdb,ahachete/gpdb,kaknikhil/gpdb,zeroae/postgres-xl,CraigHarris/gpdb,zeroae/postgres-xl,rvs/gpdb,kaknikhil/gpdb,zaksoup/gpdb,snaga/postgres-xl,cjcjameson/gpdb,ahachete/gpdb,Postgres-XL/Postgres-XL,arcivanov/postgres-xl,xinzweb/gpdb,rvs/gpdb,kmjungersen/PostgresXL,jmcatamney/gpdb,janebeckman/gpdb,jmcatamney/gpdb,pavanvd/postgres-xl,jmcatamney/gpdb,rubikloud/gpdb,Chibin/gpdb,yuanzhao/gpdb,ahachete/gpdb,rvs/gpdb,kaknikhil/gpdb,Chibin/gpdb,pavanvd/postgres-xl,kaknikhil/gpdb,ashwinstar/gpdb,rvs/gpdb,atris/gpdb,tangp3/gpdb,edespino/gpdb,arcivanov/postgres-xl,Chibin/gpdb,arcivanov/postgres-xl,0x0FFF/gpdb,ovr/postgres-xl,Chibin/gpdb,zaksoup/gpdb,arcivanov/postgres-xl,rubikloud/gpdb,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,yuanzhao/gpdb,rubikloud/gpdb,50wu/gpdb,Quikling/gpdb,rvs/gpdb,foyzur/gpdb,kaknikhil/gpdb,randomtask1155/gpdb,lisakowen/gpdb,kaknikhil/gpdb,lisakowen/gpdb,edespino/gpdb,randomtask1155/gpdb,rvs/gpdb,royc1/gpdb,CraigHarris/gpdb,zeroae/postgres-xl,lpetrov-pivotal/gpdb,0x0FFF/gpdb,tangp3/gpdb,lintzc/gpdb,adam8157/gpdb,atris/gpdb,tangp3/gpdb,atris/gpdb,Quikling/gpdb,Postgres-XL/Postgres-XL,zaksoup/gpdb,greenplum-db/gpdb,edespino/gpdb,randomtask1155/gpdb,ashwinstar/gpdb,CraigHarris/gpdb,Chibin/gpdb,royc1/gpdb,cjcjameson/gpdb,xinzweb/gpdb,0x0FFF/gpdb,foyzur/gpdb,xuegang/gpdb,jmcatamney/gpdb,chrishajas/gpdb,pavanvd/postgres-xl,pavanvd/postgres-xl,xuegang/gpdb,oberstet/postgres-xl,royc1/gpdb,foyzur/gpdb,rvs/gpdb,edespino/gpdb,CraigHarris/gpdb,oberstet/postgres-xl,lisakowen/gpdb,cjcjameson/gpdb,chrishajas/gpdb,Quikling/gpdb,cjcjameson/gpdb,foyzur/gpdb,xuegang/gpdb,chrishajas/gpdb,greenplum-db/gpdb,yazun/postgres-xl,CraigHarris/gpdb,royc1/gpdb,snaga/postgres-xl,yuanzhao/gpdb,yazun/postgres-xl,0x0FFF/gpdb,Quikling/gpdb,ashwinstar/gpdb,xinzweb/gpdb,edespino/gpdb,lisakowen/gpdb,zeroae/postgres-xl,oberstet/postgres-xl,yazun/postgres-xl,lpetrov-pivotal/gpdb,oberstet/postgres-xl,yazun/postgres-xl,kaknikhil/gpdb,lpetrov-pivotal/gpdb,chrishajas/gpdb,zeroae/postgres-xl,xuegang/gpdb,xinzweb/gpdb,yuanzhao/gpdb,lpetrov-pivotal/gpdb,0x0FFF/gpdb,jmcatamney/gpdb