When a user leaves an institution with an external auth, and
they *have* set a password for internal auth in the distant
past, they may have forgotten their username and/or their password

We can't send them their password in cleartext, as we don't have
a clear version of it, but we can send an email stating how they could
reset their password if nessecary.

Change-Id: Ibef1738832cc4c5214a232f5f3d1f8d3fd6c72a8
Signed-off-by: Hugh Davenport <hugh@catalyst.net.nz>