increase sqlite timeout in order to avoid locking issues

REF:
    https://docs.djangoproject.com/en/1.5/ref/databases/#database-is-locked-errors

Change-Id: I3dca7a6405b21225b3d9548484fa4ce6421360a3
Reviewed-on: http://review.couchbase.org/31364
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: buildbot <build@couchbase.com>