fix: better error message when network gone

pkg/ssh/ssh.go

@@ -77,6 +77,8 @@ func Fatal(hostname string, err error) error {
 		return fmt.Errorf("connection timed out for %s", hostname)
 	} else if strings.Contains(out, "Permission denied") {
 		return fmt.Errorf("ssh auth: permission denied for %s", hostname)
+	} else if strings.Contains(out, "Network is unreachable") {
+		return fmt.Errorf("unable to connect to %s, network is unreachable?", hostname)
 	} else {
 		return err
 	}