Use vendored go-swagger (#8087)

* Use vendored go-swagger

* vendor go-swagger

* revert un wanteed change

* remove un-needed GO111MODULE

* Update Makefile

Co-Authored-By: techknowlogick <matti@mdranta.net>

vendor/github.com/go-openapi/runtime/headers.go

@@ -0,0 +1,45 @@
+// Copyright 2015 go-swagger maintainers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package runtime
+
+import (
+	"mime"
+	"net/http"
+
+	"github.com/go-openapi/errors"
+)
+
+// ContentType parses a content type header
+func ContentType(headers http.Header) (string, string, error) {
+	ct := headers.Get(HeaderContentType)
+	orig := ct
+	if ct == "" {
+		ct = DefaultMime
+	}
+	if ct == "" {
+		return "", "", nil
+	}
+
+	mt, opts, err := mime.ParseMediaType(ct)
+	if err != nil {
+		return "", "", errors.NewParseError(HeaderContentType, "header", orig, err)
+	}
+
+	if cs, ok := opts[charsetKey]; ok {
+		return mt, cs, nil
+	}
+
+	return mt, "", nil
+}