pg_dump: Dump user mappings ordered by user name
pg_dump: Dump user mappings ordered by user name

This is to get a deterministic dump order independent of the order in
which the user mappings were created.

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