Fix CTAS in UTILITY MODE after QueryDispatchDesc change
Fix CTAS in UTILITY MODE after QueryDispatchDesc change

In the below referenced commit, we added a new boolean
validate_reloptions to the QueryDispatchDesc. In UTILITY MODE, the
query descriptor does not have its QueryDispatchDesc initialized so
the segment would PANIC. To fix this, we default validate_reloptions
to true if the QueryDispatchDesc is not initialized as expected before
the change.

Reference:
https://github.com/greenplum-db/gpdb/commit/a3c07830258d62ae86ce9418b84ff0ca2e73e514

Authors: Jimmy Yih and Abhijit Subramanya

yuanzhao/gpdb,lisakowen/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,adam8157/gpdb,Chibin/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,edespino/gpdb,jmcatamney/gpdb,Chibin/gpdb,adam8157/gpdb,edespino/gpdb,lisakowen/gpdb,yuanzhao/gpdb,50wu/gpdb,edespino/gpdb,adam8157/gpdb,lisakowen/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,edespino/gpdb,50wu/gpdb,jmcatamney/gpdb,edespino/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,Chibin/gpdb,xinzweb/gpdb,adam8157/gpdb,xinzweb/gpdb,jmcatamney/gpdb,xinzweb/gpdb,Chibin/gpdb,50wu/gpdb,xinzweb/gpdb,edespino/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,xinzweb/gpdb,edespino/gpdb,edespino/gpdb,lisakowen/gpdb,50wu/gpdb,greenplum-db/gpdb,xinzweb/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,edespino/gpdb,yuanzhao/gpdb,lisakowen/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,Chibin/gpdb,yuanzhao/gpdb,50wu/gpdb,edespino/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,Chibin/gpdb,adam8157/gpdb,xinzweb/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,lisakowen/gpdb,Chibin/gpdb,greenplum-db/gpdb,xinzweb/gpdb,adam8157/gpdb,50wu/gpdb,ashwinstar/gpdb,adam8157/gpdb,yuanzhao/gpdb,Chibin/gpdb,Chibin/gpdb,lisakowen/gpdb,50wu/gpdb,50wu/gpdb,greenplum-db/gpdb,Chibin/gpdb,lisakowen/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,adam8157/gpdb