Update comments on IPv6  #define.
Update comments on IPv6  #define.

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