CBLT-332:  ADD 16G sd-card to AVD to see if it will run unit tests

Change-Id: Icc25fc962d9113f3119b01e0e2a8d972b4bbabde
Reviewed-on: http://review.couchbase.org/41798
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>