CBD-485: Fix cbcompact for testing

waitTillDone option is now incorrect since compaction is
synchronous. This is to unblock QE testing

Change-Id: I1c58e5e923fcc4768bba73f18755c85a6d64a1d1
Reviewed-on: http://review.couchbase.org/34459
Reviewed-by: Sundararaman Sridharan <sundar.sridharan@gmail.com>
Tested-by: Sundararaman Sridharan <sundar.sridharan@gmail.com>