remove async form reading test from _oasis
remove async form reading test from _oasis

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