Use pflags word separators to make - and _ equiv.

cmd/hyperkube/hyperkube.go

@@ -70,6 +70,7 @@ func (hk *HyperKube) Flags() *pflag.FlagSet {
 	if hk.baseFlags == nil {
 		hk.baseFlags = pflag.NewFlagSet(hk.Name, pflag.ContinueOnError)
 		hk.baseFlags.SetOutput(ioutil.Discard)
+		hk.baseFlags.SetWordSeparators([]string{"-", "_"})
 		hk.baseFlags.BoolVarP(&hk.helpFlagVal, "help", "h", false, "help for "+hk.Name)
 
 		// These will add all of the "global" flags (defined with both the

cmd/hyperkube/server.go

@@ -68,6 +68,7 @@ func (s *Server) Flags() *pflag.FlagSet {
 	if s.flags == nil {
 		s.flags = pflag.NewFlagSet(s.Name(), pflag.ContinueOnError)
 		s.flags.SetOutput(ioutil.Discard)
+		s.flags.SetWordSeparators([]string{"-", "_"})
 	}
 	return s.flags
 }