When using a temp installation, unset PGUSER and other variables we might have inherited from the environment that would possibly cause psql to fail to connect to the temp installation properly.  Per trouble report from Markus Bertheau 7/1/03.
When using a temp installation, unset PGUSER and other variables we
might have inherited from the environment that would possibly cause
psql to fail to connect to the temp installation properly.  Per trouble
report from Markus Bertheau 7/1/03.

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