libcacard/vcard_emul_nss: add warning for old coolkey

Older coolkey versions (before the future fix of RHBZ 802435) have
a fake card reader created if no reader is detected during module
initialization. Warn libcacard users if the faulty coolkey is detected
by checking for the fake reader name "E-Gate 0 0".

Signed-off-by: Alon Levy <alevy@redhat.com>
