Addition of AUDIT_EXTENSION_DATA parameter to initialize_auditdaemon.

Move compilation of cbaudid to its own project.

Change-Id: I2810f8190d2c1ff76d360e586b99b5ccba4a1215
Reviewed-on: http://review.couchbase.org/43895
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>