Add current seek position to FDDEBUG output for FileRead, FileWrite, FileSeek.
Add current seek position to FDDEBUG output for FileRead,
FileWrite, FileSeek.

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