CBQE-1119: initial couchbase_clitest

Change-Id: Ib9dcefe9217d2c23b7bf8620c52b169e12a4ede7
Reviewed-on: http://review.couchbase.org/25310
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>