MB-24975: cbdatasource to enable DCP NO-OPs
MB-24975: cbdatasource to enable DCP NO-OPs

+ Set the control message 'set_noop_interval' to
  enable the DCP producer to send NO-OP messages
  to the cbdatasource consumer.
+ The default options to set this to a server
  default of 1 second.

Change-Id: I423298950bd9ace3d9e53eb10d7d082cfd311aed
Reviewed-on: http://review.couchbase.org/80032
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: abhinav dangeti <d73ef2279de6577f7bf081737ee47554bbb7dc82@couchbase.com>

couchbase/go-couchbase