Fix potential coredump in pg_conndefaults (assigning constant string to a field that will get free'd).  Also make it robust in cases where values contain Tcl special characters.
Fix potential coredump in pg_conndefaults (assigning constant string
to a field that will get free'd).  Also make it robust in cases where
values contain Tcl special characters.

ashwinstar/gpdb,adam8157/gpdb,Chibin/gpdb,yazun/postgres-xl,ashwinstar/gpdb,CraigHarris/gpdb,Chibin/gpdb,rvs/gpdb,tangp3/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,ahachete/gpdb,adam8157/gpdb,xuegang/gpdb,CraigHarris/gpdb,atris/gpdb,50wu/gpdb,snaga/postgres-xl,edespino/gpdb,lintzc/gpdb,randomtask1155/gpdb,randomtask1155/gpdb,chrishajas/gpdb,greenplum-db/gpdb,randomtask1155/gpdb,rvs/gpdb,janebeckman/gpdb,yuanzhao/gpdb,arcivanov/postgres-xl,zaksoup/gpdb,lisakowen/gpdb,rvs/gpdb,rubikloud/gpdb,edespino/gpdb,yuanzhao/gpdb,foyzur/gpdb,xuegang/gpdb,xinzweb/gpdb,zaksoup/gpdb,xinzweb/gpdb,zaksoup/gpdb,Quikling/gpdb,lisakowen/gpdb,lisakowen/gpdb,yuanzhao/gpdb,pavanvd/postgres-xl,zeroae/postgres-xl,arcivanov/postgres-xl,janebeckman/gpdb,yuanzhao/gpdb,atris/gpdb,Quikling/gpdb,techdragon/Postgres-XL,yuanzhao/gpdb,Postgres-XL/Postgres-XL,yazun/postgres-xl,xuegang/gpdb,yazun/postgres-xl,snaga/postgres-xl,Chibin/gpdb,lintzc/gpdb,rubikloud/gpdb,kaknikhil/gpdb,CraigHarris/gpdb,Quikling/gpdb,50wu/gpdb,foyzur/gpdb,ahachete/gpdb,cjcjameson/gpdb,postmind-net/postgres-xl,tpostgres-projects/tPostgres,chrishajas/gpdb,lintzc/gpdb,Chibin/gpdb,Quikling/gpdb,ashwinstar/gpdb,zeroae/postgres-xl,snaga/postgres-xl,ashwinstar/gpdb,yuanzhao/gpdb,atris/gpdb,jmcatamney/gpdb,edespino/gpdb,royc1/gpdb,tangp3/gpdb,yazun/postgres-xl,edespino/gpdb,greenplum-db/gpdb,zaksoup/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,CraigHarris/gpdb,atris/gpdb,janebeckman/gpdb,lintzc/gpdb,randomtask1155/gpdb,oberstet/postgres-xl,CraigHarris/gpdb,lpetrov-pivotal/gpdb,tangp3/gpdb,pavanvd/postgres-xl,foyzur/gpdb,lpetrov-pivotal/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,ahachete/gpdb,xuegang/gpdb,techdragon/Postgres-XL,tpostgres-projects/tPostgres,Quikling/gpdb,lintzc/gpdb,ahachete/gpdb,xinzweb/gpdb,arcivanov/postgres-xl,tangp3/gpdb,greenplum-db/gpdb,Chibin/gpdb,jmcatamney/gpdb,edespino/gpdb,ovr/postgres-xl,lintzc/gpdb,yuanzhao/gpdb,ahachete/gpdb,foyzur/gpdb,greenplum-db/gpdb,postmind-net/postgres-xl,zaksoup/gpdb,zaksoup/gpdb,CraigHarris/gpdb,chrishajas/gpdb,50wu/gpdb,rubikloud/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,randomtask1155/gpdb,rvs/gpdb,jmcatamney/gpdb,tangp3/gpdb,postmind-net/postgres-xl,yuanzhao/gpdb,lpetrov-pivotal/gpdb,janebeckman/gpdb,0x0FFF/gpdb,edespino/gpdb,lisakowen/gpdb,adam8157/gpdb,janebeckman/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,Quikling/gpdb,cjcjameson/gpdb,xinzweb/gpdb,kaknikhil/gpdb,atris/gpdb,Postgres-XL/Postgres-XL,tpostgres-projects/tPostgres,jmcatamney/gpdb,postmind-net/postgres-xl,chrishajas/gpdb,0x0FFF/gpdb,lisakowen/gpdb,randomtask1155/gpdb,jmcatamney/gpdb,janebeckman/gpdb,rvs/gpdb,royc1/gpdb,zaksoup/gpdb,tangp3/gpdb,Quikling/gpdb,jmcatamney/gpdb,Postgres-XL/Postgres-XL,atris/gpdb,ashwinstar/gpdb,Chibin/gpdb,royc1/gpdb,oberstet/postgres-xl,0x0FFF/gpdb,yuanzhao/gpdb,atris/gpdb,lpetrov-pivotal/gpdb,adam8157/gpdb,adam8157/gpdb,ahachete/gpdb,50wu/gpdb,zeroae/postgres-xl,techdragon/Postgres-XL,0x0FFF/gpdb,CraigHarris/gpdb,foyzur/gpdb,kaknikhil/gpdb,foyzur/gpdb,cjcjameson/gpdb,tpostgres-projects/tPostgres,arcivanov/postgres-xl,lpetrov-pivotal/gpdb,edespino/gpdb,xuegang/gpdb,edespino/gpdb,cjcjameson/gpdb,pavanvd/postgres-xl,adam8157/gpdb,chrishajas/gpdb,ovr/postgres-xl,snaga/postgres-xl,ovr/postgres-xl,chrishajas/gpdb,rvs/gpdb,edespino/gpdb,techdragon/Postgres-XL,kmjungersen/PostgresXL,50wu/gpdb,ashwinstar/gpdb,lisakowen/gpdb,oberstet/postgres-xl,rubikloud/gpdb,cjcjameson/gpdb,Postgres-XL/Postgres-XL,tangp3/gpdb,rubikloud/gpdb,0x0FFF/gpdb,kaknikhil/gpdb,janebeckman/gpdb,greenplum-db/gpdb,rvs/gpdb,randomtask1155/gpdb,royc1/gpdb,xuegang/gpdb,snaga/postgres-xl,randomtask1155/gpdb,rvs/gpdb,xinzweb/gpdb,chrishajas/gpdb,kmjungersen/PostgresXL,0x0FFF/gpdb,kmjungersen/PostgresXL,postmind-net/postgres-xl,lpetrov-pivotal/gpdb,lisakowen/gpdb,zaksoup/gpdb,ahachete/gpdb,xuegang/gpdb,royc1/gpdb,foyzur/gpdb,50wu/gpdb,xinzweb/gpdb,chrishajas/gpdb,janebeckman/gpdb,lisakowen/gpdb,kaknikhil/gpdb,xinzweb/gpdb,Chibin/gpdb,atris/gpdb,Chibin/gpdb,arcivanov/postgres-xl,cjcjameson/gpdb,oberstet/postgres-xl,kmjungersen/PostgresXL,pavanvd/postgres-xl,Chibin/gpdb,zeroae/postgres-xl,xuegang/gpdb,Postgres-XL/Postgres-XL,janebeckman/gpdb,cjcjameson/gpdb,Chibin/gpdb,yuanzhao/gpdb,CraigHarris/gpdb,lpetrov-pivotal/gpdb,0x0FFF/gpdb,janebeckman/gpdb,cjcjameson/gpdb,rvs/gpdb,Quikling/gpdb,0x0FFF/gpdb,yazun/postgres-xl,tpostgres-projects/tPostgres,50wu/gpdb,ashwinstar/gpdb,royc1/gpdb,royc1/gpdb,ovr/postgres-xl,greenplum-db/gpdb,greenplum-db/gpdb,adam8157/gpdb,lintzc/gpdb,pavanvd/postgres-xl,Quikling/gpdb,rubikloud/gpdb,adam8157/gpdb,lintzc/gpdb,rvs/gpdb,lpetrov-pivotal/gpdb,CraigHarris/gpdb,ahachete/gpdb,jmcatamney/gpdb,arcivanov/postgres-xl,royc1/gpdb,edespino/gpdb,Quikling/gpdb,tangp3/gpdb,ovr/postgres-xl,50wu/gpdb,foyzur/gpdb,rubikloud/gpdb,rubikloud/gpdb,zeroae/postgres-xl,xuegang/gpdb,kmjungersen/PostgresXL,oberstet/postgres-xl,cjcjameson/gpdb,lintzc/gpdb,kaknikhil/gpdb