PR pipeline: use 'max_in_flight: 1' and 'version: every' to ensure all PRs flow through the pipeline
PR pipeline: use 'max_in_flight: 1' and 'version: every' to ensure all PRs flow through the pipeline

Signed-off-by: Jingyi Mei <4437b9b79c7ec40b97b4eeb72d00b713e24e312a@pivotal.io>

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