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-swagger/go-swagger/generator/config.go

@@ -0,0 +1,61 @@
+package generator
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/viper"
+)
+
+// LanguageDefinition in the configuration file.
+type LanguageDefinition struct {
+	Layout SectionOpts `mapstructure:"layout"`
+}
+
+// ConfigureOpts for generation
+func (d *LanguageDefinition) ConfigureOpts(opts *GenOpts) error {
+	opts.Sections = d.Layout
+	if opts.LanguageOpts == nil {
+		opts.LanguageOpts = GoLangOpts()
+	}
+	return nil
+}
+
+// LanguageConfig structure that is obtained from parsing a config file
+type LanguageConfig map[string]LanguageDefinition
+
+// ReadConfig at the specified path, when no path is specified it will look into
+// the current directory and load a .swagger.{yml,json,hcl,toml,properties} file
+// Returns a viper config or an error
+func ReadConfig(fpath string) (*viper.Viper, error) {
+	v := viper.New()
+	if fpath != "" {
+		if !fileExists(fpath, "") {
+			return nil, fmt.Errorf("can't find file for %q", fpath)
+		}
+		file, err := os.Open(fpath)
+		if err != nil {
+			return nil, err
+		}
+		defer func() { _ = file.Close() }()
+		ext := filepath.Ext(fpath)
+		if len(ext) > 0 {
+			ext = ext[1:]
+		}
+		v.SetConfigType(ext)
+		if err := v.ReadConfig(file); err != nil {
+			return nil, err
+		}
+		return v, nil
+	}
+
+	v.SetConfigName(".swagger")
+	v.AddConfigPath(".")
+	if err := v.ReadInConfig(); err != nil {
+		if _, ok := err.(viper.UnsupportedConfigError); !ok && v.ConfigFileUsed() != "" {
+			return nil, err
+		}
+	}
+	return v, nil
+}