[bind10-dev] Add a counter for queries with RD=1 (#2796)

[Yoshitaka Aharen]

Hello,

I'm going to start working on #2796: add a counter for queries with RD=1.
As the title of the ticket directs, I'm going to count queries
(opcode=QUERY) with RD=1.
The item should be named as 'qryrecursion' in the same level as
qryauthans. I think it's not suitable to put in the same level as
'request.udp' because 'qryrecursion' is specific for queries.

If you have any suggestions, please reply.

Thank you,

-- 
Yoshitaka Aharen <aharen at jprs.co.jp>
Japan Registry Services Co., Ltd.