When adding a non-primary email via:
 set_profile_field($userid, 'email', $email, TRUE);

we shouldn't set email field in usr table to this new email address
as the usr.email should be the primary address one

Change-Id: Id8e780f3d7efa3baaae6383932e825a9cceb5e46
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>