Get rid of misleading error messages when redoing a configuration

[terrillmoore]

If you re-run against a gateway, you may see this:

INFO: jumphost: jumphost.ttni.tech: ~ttn-nyc-00-08-00-4b-04-64/.ssh exists with correct permissions
ERROR: conduit_ssh: sudo test -f /var/config/home/root/.ssh/authorized_keys failed
ERROR: conduit: 00-08-00-4b-04-64: failed: test -f /var/config/home/root/.ssh/authorized_keys
ERROR: conduit_ssh: sudo test -f /home/root/.ssh/authorized_keys failed
ERROR: conduit: 00-08-00-4b-04-64: failed: test -f /home/root/.ssh/authorized_keys
ERROR: conduit_ssh: sudo test -d /home/root/.ssh failed
ERROR: conduit: 00-08-00-4b-04-64: failed: test -d /home/root/.ssh
INFO: app: all done
INFO: __main__: success, exit with status 0

The success, exit with status 0 indicates that we succeeded. But the ERROR: lines are alarming and misleading. The last app: all done should indicate success, and the ERROR: message should be updated to be less alarming.