Update info about shared memory space calculation to match CVS tip's behavior.
Update info about shared memory space calculation to match CVS tip's behavior.

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