Document that 'sslmode' is ignored for Unix domain socket communication; backpatch to 8.3.X.
Document that 'sslmode' is ignored for Unix domain socket communication;
backpatch to 8.3.X.

Chibin/gpdb,ashwinstar/gpdb,adam8157/gpdb,50wu/gpdb,arcivanov/postgres-xl,jmcatamney/gpdb,techdragon/Postgres-XL,postmind-net/postgres-xl,50wu/gpdb,ovr/postgres-xl,kmjungersen/PostgresXL,Chibin/gpdb,ashwinstar/gpdb,50wu/gpdb,yuanzhao/gpdb,techdragon/Postgres-XL,edespino/gpdb,snaga/postgres-xl,oberstet/postgres-xl,xinzweb/gpdb,postmind-net/postgres-xl,ovr/postgres-xl,yazun/postgres-xl,snaga/postgres-xl,yuanzhao/gpdb,kmjungersen/PostgresXL,techdragon/Postgres-XL,techdragon/Postgres-XL,ashwinstar/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,lisakowen/gpdb,postmind-net/postgres-xl,arcivanov/postgres-xl,jmcatamney/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,postmind-net/postgres-xl,lisakowen/gpdb,adam8157/gpdb,adam8157/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,adam8157/gpdb,yazun/postgres-xl,arcivanov/postgres-xl,Chibin/gpdb,adam8157/gpdb,arcivanov/postgres-xl,lisakowen/gpdb,snaga/postgres-xl,greenplum-db/gpdb,adam8157/gpdb,yuanzhao/gpdb,zeroae/postgres-xl,jmcatamney/gpdb,yuanzhao/gpdb,edespino/gpdb,xinzweb/gpdb,jmcatamney/gpdb,yazun/postgres-xl,jmcatamney/gpdb,Postgres-XL/Postgres-XL,xinzweb/gpdb,ovr/postgres-xl,lisakowen/gpdb,xinzweb/gpdb,oberstet/postgres-xl,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,pavanvd/postgres-xl,edespino/gpdb,Chibin/gpdb,edespino/gpdb,Chibin/gpdb,lisakowen/gpdb,oberstet/postgres-xl,greenplum-db/gpdb,50wu/gpdb,ashwinstar/gpdb,tpostgres-projects/tPostgres,zeroae/postgres-xl,50wu/gpdb,tpostgres-projects/tPostgres,yazun/postgres-xl,kmjungersen/PostgresXL,Chibin/gpdb,Chibin/gpdb,xinzweb/gpdb,oberstet/postgres-xl,Postgres-XL/Postgres-XL,arcivanov/postgres-xl,lisakowen/gpdb,kmjungersen/PostgresXL,edespino/gpdb,zeroae/postgres-xl,snaga/postgres-xl,ashwinstar/gpdb,oberstet/postgres-xl,Postgres-XL/Postgres-XL,snaga/postgres-xl,ovr/postgres-xl,greenplum-db/gpdb,jmcatamney/gpdb,zeroae/postgres-xl,edespino/gpdb,pavanvd/postgres-xl,edespino/gpdb,xinzweb/gpdb,Postgres-XL/Postgres-XL,ashwinstar/gpdb,adam8157/gpdb,Chibin/gpdb,xinzweb/gpdb,50wu/gpdb,edespino/gpdb,yuanzhao/gpdb,arcivanov/postgres-xl,lisakowen/gpdb,pavanvd/postgres-xl,edespino/gpdb,50wu/gpdb,ovr/postgres-xl,adam8157/gpdb,greenplum-db/gpdb,edespino/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,postmind-net/postgres-xl,xinzweb/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,50wu/gpdb,yazun/postgres-xl,greenplum-db/gpdb,zeroae/postgres-xl,yuanzhao/gpdb,pavanvd/postgres-xl,ashwinstar/gpdb,kmjungersen/PostgresXL,techdragon/Postgres-XL,Postgres-XL/Postgres-XL,Chibin/gpdb,yuanzhao/gpdb,Chibin/gpdb,tpostgres-projects/tPostgres