Add note to update config.guess and config.sub at the start of beta.
Add note to update config.guess and config.sub at the start of beta.

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