Bump ORCA version to 2.7 [#139042295]
Bump ORCA version to 2.7 [#139042295]

Signed-off-by: Taylor Vesely <2e71e1faa215a6c19636ce18fd58ddc16fff98ae@pivotal.io>

50wu/gpdb,jmcatamney/gpdb,adam8157/gpdb,PengJi/gporca-comments,50wu/gpdb,PengJi/gporca-comments,lisakowen/gpdb,xinzweb/gpdb,xinzweb/gpdb,50wu/gpdb,greenplum-db/gporca,PengJi/gporca-comments,xinzweb/gpdb,greenplum-db/gporca,lisakowen/gpdb,adam8157/gpdb,xinzweb/gpdb,jmcatamney/gpdb,PengJi/gporca-comments,jmcatamney/gpdb,lisakowen/gpdb,PengJi/gporca-comments,jmcatamney/gpdb,greenplum-db/gporca,adam8157/gpdb,greenplum-db/gpdb,adam8157/gpdb,greenplum-db/gpdb,xinzweb/gpdb,adam8157/gpdb,50wu/gpdb,greenplum-db/gpdb,lisakowen/gpdb,xinzweb/gpdb,lisakowen/gpdb,50wu/gpdb,greenplum-db/gpdb,adam8157/gpdb,jmcatamney/gpdb,lisakowen/gpdb,adam8157/gpdb,adam8157/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,lisakowen/gpdb,xinzweb/gpdb,50wu/gpdb,50wu/gpdb,greenplum-db/gpdb,greenplum-db/gporca,xinzweb/gpdb,lisakowen/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,50wu/gpdb