Fix that sending multiple commands over SSH failed

The config object has to cloned before unsetting the transport because else the
transport is removed for all subsequent calls to CommandTransport::fromConfig().

fixes #8815

modules/monitoring/library/Monitoring/Command/Transport/CommandTransport.php

@@ -51,6 +51,7 @@ abstract class CommandTransport
      */
     public static function fromConfig(ConfigObject $config)
     {
+        $config = clone $config;
         switch (strtolower($config->transport)) {
             case RemoteCommandFile::TRANSPORT:
                 $transport = new RemoteCommandFile();