Put back BufferSync() for WAL after database creation. Also, add some comments about what it's for...
Put back BufferSync() for WAL after database creation.
Also, add some comments about what it's for...

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