Remove mli for Cohttp_test
Remove mli for Cohttp_test

Not needed as it's just a duplicate

inhabitedtype/ocaml-cohttp,inhabitedtype/ocaml-cohttp,Drup/ocaml-cohttp,mor1/ocaml-cohttp,dsheets/ocaml-cohttp,edwintorok/ocaml-cohttp,marklrh/ocaml-cohttp,edwintorok/ocaml-cohttp,Drup/ocaml-cohttp,dsheets/ocaml-cohttp,mor1/ocaml-cohttp,inhabitedtype/ocaml-cohttp,dsheets/ocaml-cohttp,marklrh/ocaml-cohttp,Drup/ocaml-cohttp,edwintorok/ocaml-cohttp,mor1/ocaml-cohttp,marklrh/ocaml-cohttp