Improve error message when startup or shutdown proc fails.
Improve error message when startup or shutdown proc fails.

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