change serial port to null for now, because debian networking will not start up if one of the consoles is missing (interesting).
change serial port to null for now, because debian networking will not start up if one of the consoles is missing (interesting).

git-svn-id: bf82309ee31681273af20a825c7064ea7c5af838@1002389 13f79535-47bb-0310-9956-ffa450edef68

stroucki/tashi,apache/tashi,stroucki/tashi,stroucki/tashi,apache/tashi,apache/tashi,apache/tashi