auth package refactoring

moving middleware/hooks away from package
exposing public struct UserToken accessible from other packages
fix debug log lines so the same order and naming are used

pkg/services/auth/model.go

@@ -1,25 +0,0 @@
-package auth
-
-import (
-	"errors"
-)
-
-// Typed errors
-var (
-	ErrAuthTokenNotFound = errors.New("User auth token not found")
-)
-
-type userAuthToken struct {
-	Id            int64
-	UserId        int64
-	AuthToken     string
-	PrevAuthToken string
-	UserAgent     string
-	ClientIp      string
-	AuthTokenSeen bool
-	SeenAt        int64
-	RotatedAt     int64
-	CreatedAt     int64
-	UpdatedAt     int64
-	UnhashedToken string `xorm:"-"`
-}