Fix pg_dumpall to do the right thing with "postgres" database, per Dave Page.  Also, cause it to emit rather than ignore any ACL and datconfig options that may be set for these two databases.
Fix pg_dumpall to do the right thing with "postgres" database, per
Dave Page.  Also, cause it to emit rather than ignore any ACL and
datconfig options that may be set for these two databases.

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