Add default value for master port in gppkg.
Add default value for master port in gppkg.

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