Remove unneeded condition

The CName loopkup middleware checked a hostname against the configured
domains. This check is likely a remnant from when cname lookup only
supported a single hostname. Now, however, the configured domain is
actually a list of domains, so checking a single hostname will never
match. The check isn't really needed anyway, as it has been broken since
swift 1.10.

Closes-Bug: #1402704
Change-Id: If9ff345b2c7c6d88f527cae643168bc725b26f8d
Merge "Remove unneeded condition"