Remove unused runconfig.Config.SecurityOpt field

Signed-off-by: Arnaud Porterie <arnaud.porterie@docker.com>

runconfig/config.go

@@ -33,7 +33,6 @@ type Config struct {
 	NetworkDisabled bool
 	MacAddress      string
 	OnBuild         []string
-	SecurityOpt     []string
 	Labels          map[string]string
 }