Fixed: Kazoo returns node children as Unicode.
       zc.zk client applications expect children as
       returned by the children to have bytes values and
       they use the values to connect sockets.

       ``Children`` objects returned by zc.zk.children now encode
       child names using UTF-8.

       Also fixed the testing mock to behave more like kazoo in this
       respect.
Merge pull request #2 from zopefoundation/non-unicode-children

Fixed: Kazoo returns node children as Unicode.