Bump up max_connections in the concourse builds.
Bump up max_connections in the concourse builds.

To make max_concurrency tests pass on concourse.

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