Review Request: Changed a ZooKeeper master detector test to be more permissive to avoid test failures.

[Benjamin Hindman]

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https://reviews.apache.org/r/9968/
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Review request for mesos, Vinod Kone and Ben Mahler.


Description
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See summary.


Diffs
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  src/tests/zookeeper_tests.cpp 949dcbfcc2b4d457064b44fce06ae50cd5554aaa 

Diff: https://reviews.apache.org/r/9968/diff/


Testing
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make check


Thanks,

Benjamin Hindman