Initial addition of groups to user/policy

pkg/auth/user/user.go

@@ -25,13 +25,16 @@ type Info interface {
 	// if the user is removed from the system and another user is added with
 	// the same name.
 	GetUID() string
+	// GetGroups returns the names of the groups the user is a member of
+	GetGroups() []string
 }
 
 // DefaultInfo provides a simple user information exchange object
 // for components that implement the UserInfo interface.
 type DefaultInfo struct {
-	Name string
-	UID  string
+	Name   string
+	UID    string
+	Groups []string
 }
 
 func (i *DefaultInfo) GetName() string {
@@ -41,3 +44,7 @@ func (i *DefaultInfo) GetName() string {
 func (i *DefaultInfo) GetUID() string {
 	return i.UID
 }
+
+func (i *DefaultInfo) GetGroups() []string {
+	return i.Groups
+}