adding TCP STEALTH support (without integrity protection) to HTTP(S) server

git-svn-id: https://gnunet.org/svn/gnunet@34413 140774ce-b5e7-0310-ab8b-a85725594a96
-fix warning

git-svn-id: https://gnunet.org/svn/gnunet@34414 140774ce-b5e7-0310-ab8b-a85725594a96
-rename constants

git-svn-id: https://gnunet.org/svn/gnunet@34415 140774ce-b5e7-0310-ab8b-a85725594a96