_known_hosts_real tests were failing after commit 81794a9:
FAIL: Hosts should be put in COMPREPLY
FAIL: Hosts should have username prefix and colon suffix
This is because tcl's get_hosts() is now doing a unique sort, but bash
_known_hosts_real() IS returning duplicates relying on bash's compgen/complete
to remove the duplicates). Fixed by calling _get_hosts -unsorted.