Possibility to always read user attribute values from LDAP

When user goes through the usecase like:

• Import user from LDAP to Keycloak database (For example by authenticating as this user)
• Then create LDAP mapper for some attribute "foo"
• Then authenticate again as this user. The attribute "foo" is not available on user in Keycloak. The reason is that user was already imported in step1 and user attributes are not synced anymore from LDAP.

In 1.3.1 the only possibility to sync the new attributes from LDAP is to trigger "Sync all users" or "Sync changed users"