MB-36640: Support TLSConfig callback function for custom tls.Config
MB-36640: Support TLSConfig callback function for custom tls.Config

Context: BucketDataSourceOptions

Change-Id: I32127383c6d136de5a9d51ffe176731013614953
Reviewed-on: http://review.couchbase.org/116945
Reviewed-by: Adam Fraser <0755d117a65f9ed4976c36363060a9738d4753eb@couchbase.com>
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Abhinav Dangeti <d73ef2279de6577f7bf081737ee47554bbb7dc82@couchbase.com>

couchbase/go-couchbase