fix: [0km] improve logging of favorable outcome for port checking openness

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

bin/0km

@@ -31,6 +31,8 @@ is-port-open() {
             return 1
         fi
     done
+    debug "  .. $host's port $2 is open."
+    return 0
 }
 
 resolve() {