Protocol engine bug fixes:

Protocol engine bug fixes:

   o  Make proto_config->table always point to the right
      table even if it should be the default one.
   o  When shutting down, kill protocol in reverse order
      of their priority.
   o  When stopping a protocol down, disconnect it from
      routing tables immediately instead of waiting
      for the delayed protocol flush event.

Also added a protocol instance counter (used by KRT code
in very magic ways).