GitHub pull request #3254 of commit 8c13ba0e88376edb824ae482bca7c213bdb57b22, no merge conflicts.sha1origin/pr/3254/mergeghprbActualCommit8c13ba0e88376edb824ae482bca7c213bdb57b22ghprbActualCommitAuthorghprbActualCommitAuthorEmailghprbAuthorRepoGitUrlhttps://github.com/ethercflow/bcc.gitghprbTriggerAuthorghprbTriggerAuthorEmailghprbTriggerAuthorLoginyonghong-songghprbTriggerAuthorLoginMention@yonghong-songghprbPullId3254ghprbTargetBranchmasterghprbSourceBranchmasterGIT_BRANCHmasterghprbPullAuthorEmailethercflow@gmail.comghprbPullAuthorLoginethercflowghprbPullAuthorLoginMention@ethercflowghprbPullDescriptionGitHub pull request #3254 of commit 8c13ba0e88376edb824ae482bca7c213bdb57b22, no merge conflicts.ghprbPullTitlelibbpf-tools: fix some tools error info and usageghprbPullLinkhttps://github.com/iovisor/bcc/pull/3254ghprbPullLongDescriptionSigned-off-by: Wenbo Zhang <ethercflow@gmail.com>ghprbCommentBody[buildbot, test this please]ghprbGhRepositoryiovisor/bccghprbCredentialsId6d3daf13-69b8-48b1-9c8f-ec5353264113false<a title="libbpf-tools: fix some tools error info and usage" href="https://github.com/iovisor/bcc/pull/3254">PR #3254</a>: libbpf-tools: fix some tool...#83011752017460664bcc-pr #830830false8306642SUCCESS1612646081767https://buildbot.iovisor.org/jenkins/user/davemarchevsky/my-views/view/all/job/bcc-pr/830/git830https://buildbot.iovisor.org/jenkins/user/davemarchevsky/my-views/view/all/job/bcc-pr/label=fc25/830/830https://buildbot.iovisor.org/jenkins/user/davemarchevsky/my-views/view/all/job/bcc-pr/label=fc26/830/830https://buildbot.iovisor.org/jenkins/user/davemarchevsky/my-views/view/all/job/bcc-pr/label=fc27/830/830https://buildbot.iovisor.org/jenkins/user/davemarchevsky/my-views/view/all/job/bcc-pr/label=fc28/830/830https://buildbot.iovisor.org/jenkins/user/davemarchevsky/my-views/view/all/job/bcc-pr/label=ubuntu1604/830/830https://buildbot.iovisor.org/jenkins/user/davemarchevsky/my-views/view/all/job/bcc-pr/label=ubuntu1710/830/830https://buildbot.iovisor.org/jenkins/user/davemarchevsky/my-views/view/all/job/bcc-pr/label=ubuntu1804/830/