Code review comment for lp://staging/~rogpeppe/gozk/safe-close

Reviewers: mp+94812_code.launchpad.net,

Message:
Please take a look.

Description:
I am concerned at how complex the test for this is,
relative to the simplicity of the actual code change.
(and it's also potentially fragile on a heavily loaded machine).
That said, I can't think of another way to test the
operations directly, so I'm leaving it in.
Better suggestions welcome.

https://code.launchpad.net/~rogpeppe/gozk/safe-close/+merge/94812

(do not edit description out of merge proposal)

Please review this at https://codereview.appspot.com/5699093/

Affected files:
   A close_test.go
   M retry_test.go
   M suite_test.go
   M zk.go
   M zk_test.go