List SASL config file under the cryptography maintainer's realm

No one is listed as maintainer for qemu.sasl. It is used by the
VNC server for SASL auth, but since it is cryptography related,
list it under the crytography maintainer's realm, rather than
under the UI maintainer.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>