Build failed in Jenkins: Mesos-Websitebot #2201

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See <https://builds.apache.org/job/Mesos-Websitebot/2201/display/redirect?page=changes>

Changes:

[mzhu] Removed a redundant `std::move` in the return statement.

------------------------------------------
Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on websites (git-websites svn-websites) in workspace <https://builds.apache.org/job/Mesos-Websitebot/ws/>
No credentials specified
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://gitbox.apache.org/repos/asf/mesos.git # timeout=10
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
Resetting working tree
 > git reset --hard # timeout=10
 > git clean -fdx # timeout=10
Fetching upstream changes from https://gitbox.apache.org/repos/asf/mesos.git
 > git --version # timeout=10
 > git fetch --tags --progress https://gitbox.apache.org/repos/asf/mesos.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse origin/master^{commit} # timeout=10
Checking out Revision 24d6f1b81efb4d201dc280cc166e827efa1cc43a (origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 24d6f1b81efb4d201dc280cc166e827efa1cc43a
Commit message: "Removed a redundant `std::move` in the return statement."
 > git rev-list --no-walk dcd73437549413790751d1ff127989dbb29bd753 # timeout=10
No credentials specified
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://gitbox.apache.org/repos/asf/mesos-site.git # timeout=10
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
Resetting working tree
 > git reset --hard # timeout=10
 > git clean -fdx # timeout=10
Fetching upstream changes from https://gitbox.apache.org/repos/asf/mesos-site.git
 > git --version # timeout=10
 > git fetch --tags --progress https://gitbox.apache.org/repos/asf/mesos-site.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse origin/asf-site^{commit} # timeout=10
Checking out Revision 05fe605e8652cd230402b03a45ff8e3a19219ec1 (origin/asf-site)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 05fe605e8652cd230402b03a45ff8e3a19219ec1
Commit message: "Updated the website built from mesos SHA: de7b5062b."
 > git rev-list --no-walk 05fe605e8652cd230402b03a45ff8e3a19219ec1 # timeout=10
[Mesos-Websitebot] $ /bin/bash -xe /tmp/jenkins11185455292417790455.sh
+ ./mesos/support/jenkins/websitebot.sh
~/jenkins-slave/workspace/Mesos-Websitebot/mesos ~/jenkins-slave/workspace/Mesos-Websitebot
~/jenkins-slave/workspace/Mesos-Websitebot/mesos ~/jenkins-slave/workspace/Mesos-Websitebot/mesos
./support/mesos-website.sh: line 31: docker: command not found
Build step 'Execute shell' marked build as failure

Jenkins build is back to normal : Mesos-Websitebot #2202

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See <https://builds.apache.org/job/Mesos-Websitebot/2202/display/redirect?page=changes>