Further work on tids and monitoring, tids appears to work again

  * Actually encode the TID response!
  * Do not directly send responses from tids_req_handler(), set the
    properties in the response and return with an error code
  * Add hostname to MONS_INSTANCE
  * Update tids hostname after configuration change
  * Add a tid_resp_cpy() function to duplicate a TID_RESP into a struct
    that already exists