[PATCH 5 of 7 V4] bundle2: add `pushbookmarks` part handler

[Pierre-Yves David]

On 09/06/2016 05:33 PM, Stanislau Hlebik wrote:
> But in case of push we also send ‘old’ positions of the bookmarks (they are necessary for bookmarks.pushbookmarks).
> So the part handlers should be different, don’t they?

The "old" value is related to the way pushkey works (and detect race 
condition). I'm sure we can build a part in a way it fit both usage in a 
simple way.

-- 
Pierre-Yves David