Birger Schacht 25bcee6488
backups: Show proper error when SSH server is not reachable
The backup module is connecting to the remote backup host using ssh-keyscan to
get a list of SSH public keys. When the connection fails, the form should inform
the user that there was a problem, instead of simply not listing any SSH public
keys.

Closes: #1656.

Signed-off-by: Birger Schacht <birger@rantanplan.org>
[sunil: Minor indentation]
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>
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