Fix mis-display of negative fractional seconds in interval values for --enable-integer-datetimes case.  Per report from Oliver Siegmar.
Fix mis-display of negative fractional seconds in interval values for
--enable-integer-datetimes case.  Per report from Oliver Siegmar.

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