Original design relied on aioairq.AirQ.__init__ checking if the input
was a valid IP address or an mDNS of a very specific structure,
and raising an InvalidInput otherwise.
Now, aioairq==0.3.2 removes said check completely following a user's
request to allow arbitrary host name and DNS entries.
In the config flow, "cannot_connect" covers the cases of misspelled
inputs now, which previously were covered by a dedicated "invalid_input"
1031e416be