Figure out how to send/display enrollment message when users are synced via LDAP/AD

[teon]

If the users are synced by LDAP/Active Directory they do not go through enrollment - thus the message/email is not sent. I propose that we:

1. detect that LDAP/AD is configured (meaning that most probably the user was synced)
2. detect that it's the first device user is adding - meaning probably this is actually enrollment
3. display the message & send enrollment message after the desktop/mobile client was configured for the first time.