Fix pep8 issue in SecureXMLRPCServer

Commit 35c571 introduced a pep8 issue (an extra blank line) that
produces failures in continuous integration jobs.

Change-Id: I0e2450d39bea06505c36013a10c10a5f5d61a020
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/19408
Reviewed-by: David Caro <dcaroest@redhat.com>
Reviewed-by: Timothy Asir <tjeyasin@redhat.com>
Tested-by: Timothy Asir <tjeyasin@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>