add pulseaudio finder

Change-Id: I5d860673541030aef57a3fbc60fdd4864a2ab3db
Reviewed-on: http://gerrit.aldebaran.lan/37171
Approved: hkouki <hkouki@aldebaran-robotics.com>
Reviewed-by: hkouki <hkouki@aldebaran-robotics.com>
Tested-by: hkouki <hkouki@aldebaran-robotics.com>