install swagger from source

First of all this removes the need for a network connection, second
renovate can update the version as it is tracked in go.mod.

However the real important part is that the binary downloads are
broken[1]. For some reason the swagger created with them does not
include all the type information for the examples. However when building
from source the same thing works fine.

[1] https://github.com/go-swagger/go-swagger/issues/2842

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

test/tools/vendor/github.com/go-openapi/spec/spec.go

@@ -0,0 +1,78 @@
+// 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 spec
+
+import (
+	"encoding/json"
+)
+
+//go:generate curl -L --progress -o ./schemas/v2/schema.json http://swagger.io/v2/schema.json
+//go:generate curl -L --progress  -o ./schemas/jsonschema-draft-04.json http://json-schema.org/draft-04/schema
+//go:generate go-bindata -pkg=spec -prefix=./schemas -ignore=.*\.md ./schemas/...
+//go:generate perl -pi -e s,Json,JSON,g bindata.go
+
+const (
+	// SwaggerSchemaURL the url for the swagger 2.0 schema to validate specs
+	SwaggerSchemaURL = "http://swagger.io/v2/schema.json#"
+	// JSONSchemaURL the url for the json schema schema
+	JSONSchemaURL = "http://json-schema.org/draft-04/schema#"
+)
+
+// MustLoadJSONSchemaDraft04 panics when Swagger20Schema returns an error
+func MustLoadJSONSchemaDraft04() *Schema {
+	d, e := JSONSchemaDraft04()
+	if e != nil {
+		panic(e)
+	}
+	return d
+}
+
+// JSONSchemaDraft04 loads the json schema document for json shema draft04
+func JSONSchemaDraft04() (*Schema, error) {
+	b, err := Asset("jsonschema-draft-04.json")
+	if err != nil {
+		return nil, err
+	}
+
+	schema := new(Schema)
+	if err := json.Unmarshal(b, schema); err != nil {
+		return nil, err
+	}
+	return schema, nil
+}
+
+// MustLoadSwagger20Schema panics when Swagger20Schema returns an error
+func MustLoadSwagger20Schema() *Schema {
+	d, e := Swagger20Schema()
+	if e != nil {
+		panic(e)
+	}
+	return d
+}
+
+// Swagger20Schema loads the swagger 2.0 schema from the embedded assets
+func Swagger20Schema() (*Schema, error) {
+
+	b, err := Asset("v2/schema.json")
+	if err != nil {
+		return nil, err
+	}
+
+	schema := new(Schema)
+	if err := json.Unmarshal(b, schema); err != nil {
+		return nil, err
+	}
+	return schema, nil
+}