Checkpoint commit: refactoring the request code in TIDS for better reuse

Checkpoint commit: refactoring the request code in TIDS for better reuse

  * Move tr_gss.[ch] to tr_gss_names.[ch], that is what the files contain
  * Add new tr_gss.[ch] containing generalized GSS request/response code
  * Refactor tids request handlers to use generalized code

  * First steps towards a monitoring interface handler, not functional
  * Rename listen_on_all_addrs() to tr_sock_listen_all()
  * Make better use of talloc in a few places
  * Clean up a few missing or unused #includes
  * Fix a few data types for the sake of pedantry