CBD-1199: always re-"install" deps.

Change-Id: I77e2422c93297ff9f00eaf2f0e62980d51d8739d
Reviewed-on: http://review.couchbase.org/38922
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>