Clean up handling of environment variables in path names.
Clean up handling of environment variables in path names.

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