Update pgcvslog comment on how to find branch start time.
Update pgcvslog comment on how to find branch start time.

Run autoconf/autoheader in case someone forgot in the past.

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