Remove difftime() calls.  Still uses time_t declarations, but most code will be changed for next release.
Remove difftime() calls.
 Still uses time_t declarations, but most code will be changed for next release.

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