Fix assign_pgstat_temp_directory() to ensure the directory path is canonicalized.  Avoid the need to elog(FATAL) on out-of-memory.
Fix assign_pgstat_temp_directory() to ensure the directory path is
canonicalized.  Avoid the need to elog(FATAL) on out-of-memory.

yuanzhao/gpdb,jmcatamney/gpdb,Chibin/gpdb,zeroae/postgres-xl,edespino/gpdb,Chibin/gpdb,greenplum-db/gpdb,postmind-net/postgres-xl,adam8157/gpdb,lisakowen/gpdb,pavanvd/postgres-xl,jmcatamney/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,Postgres-XL/Postgres-XL,ovr/postgres-xl,lisakowen/gpdb,greenplum-db/gpdb,techdragon/Postgres-XL,xinzweb/gpdb,50wu/gpdb,tpostgres-projects/tPostgres,xinzweb/gpdb,edespino/gpdb,lisakowen/gpdb,xinzweb/gpdb,ovr/postgres-xl,arcivanov/postgres-xl,50wu/gpdb,Postgres-XL/Postgres-XL,lisakowen/gpdb,yuanzhao/gpdb,tpostgres-projects/tPostgres,ovr/postgres-xl,yuanzhao/gpdb,50wu/gpdb,Postgres-XL/Postgres-XL,50wu/gpdb,zeroae/postgres-xl,lisakowen/gpdb,edespino/gpdb,yazun/postgres-xl,postmind-net/postgres-xl,oberstet/postgres-xl,Chibin/gpdb,50wu/gpdb,xinzweb/gpdb,edespino/gpdb,snaga/postgres-xl,zeroae/postgres-xl,jmcatamney/gpdb,yazun/postgres-xl,adam8157/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,pavanvd/postgres-xl,snaga/postgres-xl,greenplum-db/gpdb,pavanvd/postgres-xl,snaga/postgres-xl,yuanzhao/gpdb,zeroae/postgres-xl,edespino/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,arcivanov/postgres-xl,arcivanov/postgres-xl,xinzweb/gpdb,ashwinstar/gpdb,arcivanov/postgres-xl,kmjungersen/PostgresXL,Postgres-XL/Postgres-XL,adam8157/gpdb,tpostgres-projects/tPostgres,xinzweb/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,ovr/postgres-xl,Chibin/gpdb,yuanzhao/gpdb,techdragon/Postgres-XL,jmcatamney/gpdb,xinzweb/gpdb,ovr/postgres-xl,techdragon/Postgres-XL,Chibin/gpdb,tpostgres-projects/tPostgres,edespino/gpdb,techdragon/Postgres-XL,oberstet/postgres-xl,edespino/gpdb,ashwinstar/gpdb,arcivanov/postgres-xl,Chibin/gpdb,kmjungersen/PostgresXL,50wu/gpdb,oberstet/postgres-xl,tpostgres-projects/tPostgres,adam8157/gpdb,ashwinstar/gpdb,lisakowen/gpdb,jmcatamney/gpdb,postmind-net/postgres-xl,snaga/postgres-xl,edespino/gpdb,arcivanov/postgres-xl,postmind-net/postgres-xl,adam8157/gpdb,yazun/postgres-xl,Chibin/gpdb,adam8157/gpdb,yazun/postgres-xl,xinzweb/gpdb,edespino/gpdb,ashwinstar/gpdb,snaga/postgres-xl,postmind-net/postgres-xl,greenplum-db/gpdb,oberstet/postgres-xl,techdragon/Postgres-XL,lisakowen/gpdb,oberstet/postgres-xl,zeroae/postgres-xl,jmcatamney/gpdb,Chibin/gpdb,50wu/gpdb,ashwinstar/gpdb,50wu/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,yuanzhao/gpdb,adam8157/gpdb,lisakowen/gpdb,yazun/postgres-xl,jmcatamney/gpdb,kmjungersen/PostgresXL,Postgres-XL/Postgres-XL,yuanzhao/gpdb,kmjungersen/PostgresXL,Chibin/gpdb,pavanvd/postgres-xl,pavanvd/postgres-xl,edespino/gpdb,kmjungersen/PostgresXL,greenplum-db/gpdb,adam8157/gpdb,Chibin/gpdb