Bump optimizer version from 1.607 to 1.608.
Bump optimizer version from 1.607 to 1.608.

kaknikhil/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,foyzur/gpdb,0x0FFF/gpdb,50wu/gpdb,randomtask1155/gpdb,greenplum-db/gpdb,zaksoup/gpdb,randomtask1155/gpdb,xinzweb/gpdb,cjcjameson/gpdb,50wu/gpdb,randomtask1155/gpdb,randomtask1155/gpdb,lintzc/gpdb,Chibin/gpdb,foyzur/gpdb,yuanzhao/gpdb,randomtask1155/gpdb,randomtask1155/gpdb,ahachete/gpdb,CraigHarris/gpdb,kaknikhil/gpdb,chrishajas/gpdb,lpetrov-pivotal/gpdb,adam8157/gpdb,lisakowen/gpdb,chrishajas/gpdb,yuanzhao/gpdb,tangp3/gpdb,lisakowen/gpdb,atris/gpdb,jmcatamney/gpdb,0x0FFF/gpdb,Chibin/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,chrishajas/gpdb,0x0FFF/gpdb,50wu/gpdb,ashwinstar/gpdb,lintzc/gpdb,xinzweb/gpdb,rvs/gpdb,randomtask1155/gpdb,Quikling/gpdb,xuegang/gpdb,chrishajas/gpdb,CraigHarris/gpdb,0x0FFF/gpdb,tangp3/gpdb,royc1/gpdb,zaksoup/gpdb,foyzur/gpdb,CraigHarris/gpdb,cjcjameson/gpdb,Quikling/gpdb,Quikling/gpdb,lintzc/gpdb,greenplum-db/gpdb,atris/gpdb,Quikling/gpdb,ahachete/gpdb,kaknikhil/gpdb,lisakowen/gpdb,foyzur/gpdb,ahachete/gpdb,atris/gpdb,ashwinstar/gpdb,edespino/gpdb,kaknikhil/gpdb,lisakowen/gpdb,lintzc/gpdb,ashwinstar/gpdb,ahachete/gpdb,yuanzhao/gpdb,xuegang/gpdb,50wu/gpdb,CraigHarris/gpdb,chrishajas/gpdb,atris/gpdb,kaknikhil/gpdb,royc1/gpdb,edespino/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,rvs/gpdb,jmcatamney/gpdb,CraigHarris/gpdb,rubikloud/gpdb,rubikloud/gpdb,rvs/gpdb,xinzweb/gpdb,janebeckman/gpdb,foyzur/gpdb,adam8157/gpdb,tangp3/gpdb,edespino/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,royc1/gpdb,rvs/gpdb,zaksoup/gpdb,yuanzhao/gpdb,yuanzhao/gpdb,Chibin/gpdb,xuegang/gpdb,xinzweb/gpdb,rvs/gpdb,tangp3/gpdb,jmcatamney/gpdb,CraigHarris/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,royc1/gpdb,adam8157/gpdb,lpetrov-pivotal/gpdb,janebeckman/gpdb,rubikloud/gpdb,foyzur/gpdb,adam8157/gpdb,kaknikhil/gpdb,rvs/gpdb,Chibin/gpdb,tangp3/gpdb,xuegang/gpdb,atris/gpdb,xinzweb/gpdb,greenplum-db/gpdb,lpetrov-pivotal/gpdb,xinzweb/gpdb,lisakowen/gpdb,Quikling/gpdb,xinzweb/gpdb,kaknikhil/gpdb,lisakowen/gpdb,rvs/gpdb,royc1/gpdb,ashwinstar/gpdb,Quikling/gpdb,kaknikhil/gpdb,0x0FFF/gpdb,edespino/gpdb,ahachete/gpdb,atris/gpdb,tangp3/gpdb,CraigHarris/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,xinzweb/gpdb,xuegang/gpdb,edespino/gpdb,ahachete/gpdb,zaksoup/gpdb,kaknikhil/gpdb,Quikling/gpdb,adam8157/gpdb,xuegang/gpdb,lintzc/gpdb,lpetrov-pivotal/gpdb,Quikling/gpdb,chrishajas/gpdb,Chibin/gpdb,Chibin/gpdb,CraigHarris/gpdb,lpetrov-pivotal/gpdb,rubikloud/gpdb,greenplum-db/gpdb,Chibin/gpdb,Chibin/gpdb,greenplum-db/gpdb,Quikling/gpdb,ashwinstar/gpdb,royc1/gpdb,50wu/gpdb,foyzur/gpdb,edespino/gpdb,adam8157/gpdb,chrishajas/gpdb,CraigHarris/gpdb,0x0FFF/gpdb,rubikloud/gpdb,xuegang/gpdb,tangp3/gpdb,edespino/gpdb,cjcjameson/gpdb,Quikling/gpdb,50wu/gpdb,randomtask1155/gpdb,lisakowen/gpdb,atris/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,rvs/gpdb,xuegang/gpdb,lintzc/gpdb,janebeckman/gpdb,lintzc/gpdb,ashwinstar/gpdb,ahachete/gpdb,janebeckman/gpdb,cjcjameson/gpdb,0x0FFF/gpdb,edespino/gpdb,tangp3/gpdb,greenplum-db/gpdb,zaksoup/gpdb,atris/gpdb,kaknikhil/gpdb,jmcatamney/gpdb,chrishajas/gpdb,janebeckman/gpdb,rubikloud/gpdb,royc1/gpdb,edespino/gpdb,cjcjameson/gpdb,50wu/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,janebeckman/gpdb,janebeckman/gpdb,0x0FFF/gpdb,adam8157/gpdb,ahachete/gpdb,rvs/gpdb,Chibin/gpdb,rubikloud/gpdb,jmcatamney/gpdb,xuegang/gpdb,royc1/gpdb,lisakowen/gpdb,lpetrov-pivotal/gpdb,zaksoup/gpdb,zaksoup/gpdb,lintzc/gpdb,zaksoup/gpdb,adam8157/gpdb,yuanzhao/gpdb,foyzur/gpdb,janebeckman/gpdb,Chibin/gpdb,50wu/gpdb,rvs/gpdb,lintzc/gpdb,janebeckman/gpdb,lpetrov-pivotal/gpdb,rubikloud/gpdb,janebeckman/gpdb,lpetrov-pivotal/gpdb,edespino/gpdb