gpcloud: fix S3QueryAbort message
gpcloud: fix S3QueryAbort message

S3QueryAbort's message was hardcoded to "Query is aborted". This commit
initializes it via constructor.

edespino/gpdb,greenplum-db/gpdb,adam8157/gpdb,greenplum-db/gpdb,edespino/gpdb,edespino/gpdb,xinzweb/gpdb,Quikling/gpdb,lisakowen/gpdb,cjcjameson/gpdb,jmcatamney/gpdb,lisakowen/gpdb,Quikling/gpdb,50wu/gpdb,Chibin/gpdb,50wu/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,janebeckman/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,50wu/gpdb,xinzweb/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,rvs/gpdb,adam8157/gpdb,50wu/gpdb,edespino/gpdb,Chibin/gpdb,lisakowen/gpdb,ashwinstar/gpdb,adam8157/gpdb,edespino/gpdb,kaknikhil/gpdb,janebeckman/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,Quikling/gpdb,rvs/gpdb,Chibin/gpdb,kaknikhil/gpdb,adam8157/gpdb,Quikling/gpdb,xinzweb/gpdb,rvs/gpdb,Quikling/gpdb,lisakowen/gpdb,50wu/gpdb,rvs/gpdb,rvs/gpdb,lisakowen/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,Chibin/gpdb,Quikling/gpdb,Chibin/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,adam8157/gpdb,kaknikhil/gpdb,rvs/gpdb,lisakowen/gpdb,jmcatamney/gpdb,Quikling/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,cjcjameson/gpdb,adam8157/gpdb,yuanzhao/gpdb,50wu/gpdb,jmcatamney/gpdb,janebeckman/gpdb,50wu/gpdb,Chibin/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,xinzweb/gpdb,yuanzhao/gpdb,lisakowen/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,adam8157/gpdb,greenplum-db/gpdb,50wu/gpdb,janebeckman/gpdb,edespino/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,edespino/gpdb,edespino/gpdb,Quikling/gpdb,Quikling/gpdb,Chibin/gpdb,adam8157/gpdb,cjcjameson/gpdb,Chibin/gpdb,cjcjameson/gpdb,rvs/gpdb,ashwinstar/gpdb,cjcjameson/gpdb,Quikling/gpdb,rvs/gpdb,kaknikhil/gpdb,lisakowen/gpdb,rvs/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,janebeckman/gpdb,xinzweb/gpdb,Chibin/gpdb,Chibin/gpdb,jmcatamney/gpdb,janebeckman/gpdb,ashwinstar/gpdb,cjcjameson/gpdb,janebeckman/gpdb,cjcjameson/gpdb,janebeckman/gpdb,xinzweb/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,kaknikhil/gpdb,xinzweb/gpdb,rvs/gpdb,edespino/gpdb,yuanzhao/gpdb,janebeckman/gpdb,greenplum-db/gpdb,edespino/gpdb,xinzweb/gpdb,janebeckman/gpdb