CBD-1425:  get dependencies from non-expiring S3 bucket:

    "http://packages.couchbase.com/couchbase-server/deps"

instead of:

    "http://packages.northscale.com/deps"

Change-Id: Ic837e75e01998eb8af15939ee737f016bb4f0e0d
Reviewed-on: http://review.couchbase.org/41923
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>