Build failed in Jenkins: Mesos-Reviewbot #21609

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See <https://builds.apache.org/job/Mesos-Reviewbot/21609/display/redirect>

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[URLTrigger] A change within the response URL invocation (log)
[EnvInject] - Loading node environment variables.
Building remotely on H21 (ubuntu xenial) in workspace <https://builds.apache.org/job/Mesos-Reviewbot/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://git-wip-us.apache.org/repos/asf/mesos.git # timeout=10
Fetching upstream changes from https://git-wip-us.apache.org/repos/asf/mesos.git
 > git --version # timeout=10
 > git fetch --tags --progress https://git-wip-us.apache.org/repos/asf/mesos.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse origin/master^{commit} # timeout=10
Checking out Revision 51c03b50adbf32a79132384cc3dfe412667f2870 (origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 51c03b50adbf32a79132384cc3dfe412667f2870
Commit message: "Updated the Mesos-Mini Jenkins script to update latest tag."
 > git rev-list 51c03b50adbf32a79132384cc3dfe412667f2870 # timeout=10
 > git tag -a -f -m Jenkins Build #21609 jenkins-Mesos-Reviewbot-21609 # timeout=10
[EnvInject] - Executing scripts and injecting environment variables after the SCM step.
[EnvInject] - Injecting as environment variables the properties content 
USERNAME=mesos-review

[EnvInject] - Variables injected successfully.
[EnvInject] - Mask passwords that will be passed as build parameters.
[Mesos-Reviewbot] $ /bin/bash -xe /tmp/jenkins612568160746075712.sh
+ ./support/jenkins/reviewbot.sh
docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?.
See 'docker run --help'.
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
"docker rmi" requires at least 1 argument(s).
See 'docker rmi --help'.

Usage:  docker rmi [OPTIONS] IMAGE [IMAGE...]

Remove one or more images
Build step 'Execute shell' marked build as failure

Jenkins build is back to normal : Mesos-Reviewbot #21610

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See <https://builds.apache.org/job/Mesos-Reviewbot/21610/display/redirect?page=changes>