Trivial, the qbt script isn't executable, unlike the other scripts in dev-support/bin.
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Committed this to trunk, branch-2, and branch-2.8. Thanks Andrew Wang for the contribution.
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #10917 (See https://builds.apache.org/job/Hadoop-trunk-Commit/10917/)
HADOOP-13790. Make qbt script executable. Contributed by Andrew Wang. (aajisaka: rev be5a757096246d5c4ef73da9d233adda67bd3d69)