add locking around auth info in zhandle_t

                 Key: ZOOKEEPER-319
             Project: Zookeeper
          Issue Type: Bug
          Components: c client
    Affects Versions: 3.1.0, 3.0.1, 3.0.0
            Reporter: Chris Darroch
             Fix For: 3.1.1, 3.2.0

Looking over the zookeeper.c code it appears to me that the zoo_add_auth() 
function may be called at any time by the user in their "main" thread.  This 
function alters the elements of the auth_info structure in the zhandle_t 

Meanwhile, the IO thread may read those elements at any time in such functions 
as send_auth_info() and auth_completion_func().  It seems important, then, to 
add a lock which prevents data being read by the IO thread while only partially 
changed by the user's thread.  The attached patch add such a lock.

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