Fixing the cert-request comparing whole email address case-sensitively.
Now, the cert-request command compares the domain part of the
email case-insensitively.
https://pagure.io/freeipa/issue/5919
Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>