CBLT-159:  can't use wget on S3 package store

Change-Id: Idd44ff8bf152c171b8480cab30f2f22934a3ecef
Reviewed-on: http://review.couchbase.org/37922
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>