Fixed `_known_hosts_real' to allow for multiple patterns in ssh config, e.g.:
Host foo.example.net bar.example.net
IFS was set to just newline (\n), whereas `compgen -W' relies on IFS
being space-tab-newline ( \t\n) to expand hostnames which are separated
by whitespace.
Tests are updated as well (added host `jar' to config). To run the tests:
./runUnit _known_hosts_real.exp