Clean up path handling esp. when interpreting environment variables. Remove unused old code.
Clean up path handling esp. when interpreting environment variables.
Remove unused old code.

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