CBIT-532:  use 'go get' to fetch 3rd party source, then git to sync tuqtng to GITSPEC

Change-Id: I57788bf732986cf4e67e5524219d491669d8b889
Reviewed-on: http://review.couchbase.org/37781
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>