Bug fixes in killtree.sh (contributed by Jie Yu, https://reviews.apache.org/r/5429).
Bug fixes in killtree.sh (contributed by Jie Yu,
https://reviews.apache.org/r/5429).

git-svn-id: 03d7800a49d8905ef4fbcc296184319e19243493@1359823 13f79535-47bb-0310-9956-ffa450edef68

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