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/loads/fmts/yaml.go

@@ -0,0 +1,30 @@
+// 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 fmts
+
+import "github.com/go-openapi/swag"
+
+var (
+	// YAMLMatcher matches yaml
+	YAMLMatcher = swag.YAMLMatcher
+	// YAMLToJSON converts YAML unmarshaled data into json compatible data
+	YAMLToJSON = swag.YAMLToJSON
+	// BytesToYAMLDoc converts raw bytes to a map[string]interface{}
+	BytesToYAMLDoc = swag.BytesToYAMLDoc
+	// YAMLDoc loads a yaml document from either http or a file and converts it to json
+	YAMLDoc = swag.YAMLDoc
+	// YAMLData loads a yaml document from either http or a file
+	YAMLData = swag.YAMLData
+)