Improve error message on ssh login failure.

Also use the GERRITHOST variable instead of magic text.

Change-Id: I3314be81017f64fca8aa756cca1715081ad01641
Reviewed-on: https://gerrit.libreoffice.org/41988Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>

logerrit

@@ -128,8 +128,8 @@ case "$1" in
         then
             echo "Your gerrit setup was successful!"
         else
-            echo "There seems to be trouble."
-            echo "please have the output of: ssh -vvvv logerrit"
+            echo "There seems to be trouble. Please have the output of:"
+            echo "ssh -vvvv "$GERRITHOST
             echo "at hand when looking for help."
         fi
     ;;