Added pflua submodule
Use pflua submodule dependencies
Update to commit 9db8cbea6c2bfc7331f5780d7729fc75c54b8830

commit 9db8cbea6c2bfc7331f5780d7729fc75c54b8830
Author: Javier M. Mellid <jmunhoz@igalia.com>
Date:   Thu Jul 10 12:41:19 2014 +0200

Use pflua-bench paths under submodule config

If pflua runs under pflua-bench as a submodule then overrides all paths
(tests and pcaps) in order to use pflua-bench configuration.

...
Add 'test-bpf-pflua' makefile target

* Makefile