Land rapid7#4703, IAX2 self.debugging for dprint

Needs to be set for iaxrecord.rb -d to work.

Author: wvu

lib/rex/proto/iax2/client.rb

@@ -34,6 +34,7 @@ def initialize(uopts={})
     self.server_port   = opts[:server_port]
     self.username      = opts[:username]
     self.password      = opts[:password]
+    self.debugging     = opts[:debugging]
 
     self.sock = Rex::Socket::Udp.create(
       'PeerHost' => self.server_host,