echo timestamp after random sleep, to see if execution order is
related to unit test timeouts in sync_gateway

Change-Id: I7ce9b4d2b3a406f8d0b4e8c3ac781c3463deb41b
Reviewed-on: http://review.couchbase.org/39358
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>