MB-5999: try 2.0DP4-style URL if official ddoc URL fails
MB-5999: try 2.0DP4-style URL if official ddoc URL fails

Change-Id: I63b8864a16efd51ce2d79039d2a1814448708cfc
Reviewed-on: http://review.couchbase.org/18765
Reviewed-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

couchbaselabs/couchbase-cli,membase/membase-cli,membase/membase-cli,couchbaselabs/couchbase-cli,couchbase/couchbase-cli,membase/membase-cli,couchbaselabs/couchbase-cli,couchbase/couchbase-cli