Transport priority changes

Pass in the "lhost" and "lport" options to the default transport during the native payload. This takes the following LHOST priorities:
1. OverrideLHOST, only if OverrideRequestHost is TRUE
2. The request Host: header.
3. The LHOST datastore.

Author: sammbertram

lib/msf/core/handler/reverse_http.rb

@@ -351,7 +351,9 @@ def on_request(cli, req, obj)
         # we don't get new ones generated.
         blob = obj.stage_payload(
           uuid: uuid,
-          uri:  conn_id
+          uri:  conn_id,
+          lhost: datastore['OverrideRequestHost'] ? datastore['OverrideLHOST'] : (req && req.headers && req.headers['Host']) ? req.headers['Host'] : datastore['LHOST'],
+          lport: datastore['OverrideRequestHost'] ? datastore['OverrideLPORT'] : datastore['LPORT']
         )
 
         resp.body = encode_stage(blob)