No longer validate source hostname with MiqSshUtil
No longer validate source hostname with MiqSshUtil

Way back in e6dcb57e41a5b9a2326dbadecd995808f9e043d3, code was added to make
sure that the appliance had a valid hostname before attempting to SSH from the
appliance to another box.  The reasoning at the time was that the SSH gem would
ignore a failure caused by having an invalid appliance hostname, but then later
blow up because of the invalid appliance hostname.

It does not appears that SSH even cares about the appliance's hostname anymore
when establishing an SSH connection to another server (in fact, it was
surprising that it even would care).

With this check removed, validating a host's SSH credentials will no longer
throw a misleading "getaddrinfo" error when the appliance has a bad hostname.

https://bugzilla.redhat.com/show_bug.cgi?id=1278904

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