LPS-45580 LDAP Export doesn't work when e-mail address verification is required

Hi Norbi,

The issue is same as https://github.com/NorbertKocsis/liferay-portal/pull/7, but @mhan810 requested some refactoring to move the original email address storing to UserListener.onBeforeUpdate() see the discussion here: https://github.com/vilmospapp/liferay-portal/pull/51

Regards,
Vilmos