MM-9849 Added tracking of which settings are set through environment variables (#8586)

* MM-9849 Added tracking of which settings are set through environment variables

* Removed old version of viper

* Added forked version of viper

* Fixed unit tests

* Fixed more unit tests

* Removed copy from App.GetEnvironmentConfig

vendor/github.com/spf13/viper/nohup.out

@@ -1 +0,0 @@
-QProcess::start: Process is already running

vendor/github.com/spf13/viper/viper.go

@@ -1675,6 +1675,26 @@ func (v *Viper) AllSettings() map[string]interface{} {
 	return m
 }
 
+// EnvSettings returns a map[string]interface{} containing all settings set
+// through environment variables.
+func EnvSettings() map[string]interface{} { return v.EnvSettings() }
+func (v *Viper) EnvSettings() map[string]interface{} {
+	m := map[string]interface{}{}
+	// start from the list of keys, and construct the map one value at a time
+	for _, k := range v.AllKeys() {
+		value := v.getEnv(v.mergeWithEnvPrefix(k))
+		if value == "" {
+			continue
+		}
+		path := strings.Split(k, v.keyDelim)
+		lastKey := strings.ToLower(path[len(path)-1])
+		deepestMap := deepSearch(m, path[0:len(path)-1])
+		// set innermost value
+		deepestMap[lastKey] = true
+	}
+	return m
+}
+
 // SetFs sets the filesystem to use to read configuration.
 func SetFs(fs afero.Fs) { v.SetFs(fs) }
 func (v *Viper) SetFs(fs afero.Fs) {
@@ -1720,18 +1740,14 @@ func (v *Viper) getConfigType() string {
 }
 
 func (v *Viper) getConfigFile() (string, error) {
-	// if explicitly set, then use it
-	if v.configFile != "" {
-		return v.configFile, nil
+	if v.configFile == "" {
+		cf, err := v.findConfigFile()
+		if err != nil {
+			return "", err
+		}
+		v.configFile = cf
 	}
-
-	cf, err := v.findConfigFile()
-	if err != nil {
-		return "", err
-	}
-
-	v.configFile = cf
-	return v.getConfigFile()
+	return v.configFile, nil
 }
 
 func (v *Viper) searchInPath(in string) (filename string) {