Mod: Added flaggy to vendor directory

Signed-off-by: Glenn Vriesman <glenn.vriesman@gmail.com>

vendor/github.com/integrii/flaggy/argumentParser.go

@@ -0,0 +1,29 @@
+package flaggy
+
+// setValueForParsers sets the value for a specified key in the
+// specified parsers (which normally include a Parser and Subcommand).
+// The return values represent the key being set, and any errors
+// returned when setting the key, such as failures to convert the string
+// into the appropriate flag value.  We stop assigning values as soon
+// as we find a parser that accepts it.
+func setValueForParsers(key string, value string, parsers ...ArgumentParser) (bool, error) {
+
+	var valueWasSet bool
+
+	for _, p := range parsers {
+		valueWasSet, err := p.SetValueForKey(key, value)
+		if err != nil {
+			return valueWasSet, err
+		}
+		if valueWasSet {
+			break
+		}
+	}
+
+	return valueWasSet, nil
+}
+
+// ArgumentParser represents a parser or subcommand
+type ArgumentParser interface {
+	SetValueForKey(key string, value string) (bool, error)
+}