Commit bfbf0d1e78ff47937adb06bce648a0b915c838d1 removed a check that was
meant to avoid to resolve a storage domain. It breaks the behavior of the
middleware as the resolution of a storage domain will return nothing, so
the global resolution will fail.
Example:
Host header: storage.example.com
storage_domain: [.storage.example.com]
Host does not end with one of the storage_domains (because of the dot),
so the middleware will loop to resolve the CNAME of storage.example.com,
but it won't succeed because it's a storage_domain.
Closes-Bug: #1311435
Change-Id: If594b816ff2f7025521de716b32c42bf3137f5dd
9a17e61e7f