Error out in pg_rewind if lstat() fails.
Error out in pg_rewind if lstat() fails.

A "file not found" is expected if the source server is running, so don't
complain about that. But any other error is definitely not expected.

lisakowen/gpdb,pavanvd/postgres-xl,50wu/gpdb,50wu/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,Postgres-XL/Postgres-XL,greenplum-db/gpdb,greenplum-db/gpdb,techdragon/Postgres-XL,xinzweb/gpdb,oberstet/postgres-xl,lisakowen/gpdb,lisakowen/gpdb,adam8157/gpdb,50wu/gpdb,jmcatamney/gpdb,pavanvd/postgres-xl,jmcatamney/gpdb,zeroae/postgres-xl,pavanvd/postgres-xl,oberstet/postgres-xl,lisakowen/gpdb,adam8157/gpdb,xinzweb/gpdb,adam8157/gpdb,greenplum-db/gpdb,Postgres-XL/Postgres-XL,xinzweb/gpdb,ovr/postgres-xl,techdragon/Postgres-XL,oberstet/postgres-xl,adam8157/gpdb,zeroae/postgres-xl,xinzweb/gpdb,greenplum-db/gpdb,zeroae/postgres-xl,yazun/postgres-xl,oberstet/postgres-xl,adam8157/gpdb,techdragon/Postgres-XL,50wu/gpdb,ovr/postgres-xl,techdragon/Postgres-XL,yazun/postgres-xl,jmcatamney/gpdb,pavanvd/postgres-xl,50wu/gpdb,Postgres-XL/Postgres-XL,ovr/postgres-xl,adam8157/gpdb,Postgres-XL/Postgres-XL,50wu/gpdb,lisakowen/gpdb,50wu/gpdb,ashwinstar/gpdb,adam8157/gpdb,yazun/postgres-xl,xinzweb/gpdb,ashwinstar/gpdb,xinzweb/gpdb,greenplum-db/gpdb,lisakowen/gpdb,ashwinstar/gpdb,yazun/postgres-xl,ashwinstar/gpdb,yazun/postgres-xl,ovr/postgres-xl,greenplum-db/gpdb,adam8157/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,Postgres-XL/Postgres-XL,xinzweb/gpdb,zeroae/postgres-xl,ashwinstar/gpdb,50wu/gpdb,jmcatamney/gpdb,zeroae/postgres-xl,xinzweb/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,ashwinstar/gpdb,oberstet/postgres-xl,lisakowen/gpdb,techdragon/Postgres-XL,ovr/postgres-xl,ashwinstar/gpdb