PLT-1465 Added password requirements (#3489)

* Added password requirements

* added tweaks

* fixed error code

* removed http.StatusNotAcceptable

model/user.go

@@ -27,7 +27,6 @@ const (
 	DEFAULT_LOCALE             = "en"
 	USER_AUTH_SERVICE_EMAIL    = "email"
 	USER_AUTH_SERVICE_USERNAME = "username"
-	MIN_PASSWORD_LENGTH        = 5
 )
 
 type User struct {
@@ -95,10 +94,6 @@ func (u *User) IsValid() *AppError {
 		return NewLocAppError("User.IsValid", "model.user.is_valid.last_name.app_error", nil, "user_id="+u.Id)
 	}
 
-	if len(u.Password) > 128 {
-		return NewLocAppError("User.IsValid", "model.user.is_valid.pwd.app_error", nil, "user_id="+u.Id)
-	}
-
 	if u.AuthData != nil && len(*u.AuthData) > 128 {
 		return NewLocAppError("User.IsValid", "model.user.is_valid.auth_data.app_error", nil, "user_id="+u.Id)
 	}