Try to silence debug log messages that appear in buildbot's ci builds.
Try to silence debug log messages that appear in buildbot's ci builds.

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1846305 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: cace3d78ac3b8b1b8baa108c214e03cb340aaf6d
apache/jmeter,etnetera/jmeter,ham1/jmeter,benbenw/jmeter,etnetera/jmeter,apache/jmeter,benbenw/jmeter,ham1/jmeter,apache/jmeter,benbenw/jmeter,etnetera/jmeter,etnetera/jmeter,etnetera/jmeter,benbenw/jmeter,ham1/jmeter,apache/jmeter,ham1/jmeter,apache/jmeter,ham1/jmeter