CBD-688:CLI func spec for new 2.0 REST api

Change-Id: I812e5a2c0b3b8175819ab20ca7ce79b4c109059b
Reviewed-on: http://review.couchbase.org/24455
Reviewed-by: Bin Cui <bin.cui@gmail.com>
Tested-by: Bin Cui <bin.cui@gmail.com>