openflow: Add webservice usage notes
openflow: Add webservice usage notes

There are some comments showing how to use the webservice from the
commandline.  This commits adds further notes on using it with
HTTP authentication and POX CookieGuard.

noxrepo/pox,noxrepo/pox,MurphyMc/pox,MurphyMc/pox,noxrepo/pox,noxrepo/pox,MurphyMc/pox,MurphyMc/pox,MurphyMc/pox