Review Request 45839: Fixed commit message hook to not lint the diff in verbose mode.

[Michael Park]

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Review request for mesos, Joerg Schad, Kevin Klues, and Vinod Kone.


Bugs: MESOS-5132
    https://issues.apache.org/jira/browse/MESOS-5132


Repository: mesos


Description
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See summary.


Diffs
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  support/hooks/commit-msg b32ee92da7ced33aea60ed4a02b2b98d3611fb9a 

Diff: https://reviews.apache.org/r/45839/diff/


Testing
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Thanks,

Michael Park