Use fork_process() to avoid some fork()-related boilerplate code when forking the stats collector child process.
Use fork_process() to avoid some fork()-related boilerplate code when
forking the stats collector child process.

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