Fix initdb to not generate misleading error messages when postgres.bki or other share-directory files are inaccessible for some reason other than not existing.  Inspired by trouble report from Simon Kinsella.
Fix initdb to not generate misleading error messages when postgres.bki
or other share-directory files are inaccessible for some reason other
than not existing.  Inspired by trouble report from Simon Kinsella.

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