False up-to-date msg if repo check fails

[vanosg]

Checking whether the update script is up to date
Warning: Permanently added the RSA host key for IP address '192.30.252.129' to the list of known hosts.
Permission denied (publickey).
fatal: The remote end hung up unexpectedly
/home/geo/BrewPi/brewpi-tools is up-to-date.

We'll need to error check connections, otherwise we get a false up-to-date message