zkPython's NodeExistsException should include information about the node that 
exists
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                 Key: ZOOKEEPER-748
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-748
             Project: Zookeeper
          Issue Type: Improvement
          Components: contrib-bindings
    Affects Versions: 3.3.0
            Reporter: Joseph Koshy


Currently the code creates a {{zookeeper.NodeExistsException}} object with a 
string argument "node exists".

Including the name of the node that caused the exception would be useful, in 
that it allows user code like the following:
{code:title=example1}
try:
  zookeeper.create(zh, n1, ...)
  zookeeper.create(zh, n2, ...)
except zookeeper.NodeExistsException, n:
  print "Node \"%s\" exists." % n
{code}

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