Build failed in Jenkins: Mesos-Reviewbot #21613

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See <https://builds.apache.org/job/Mesos-Reviewbot/21613/display/redirect?page=changes>

Changes:

[bbannier] Started from merge-base when posting reviews.

------------------------------------------
Started by an SCM change
Started by an SCM change
Started by an SCM change
Started by an SCM change
Started by an SCM change
Started by an SCM change
Started by an SCM change
Started by an SCM change
Started by an SCM change
Started by an SCM change
[URLTrigger] A change within the response URL invocation (log)
[URLTrigger] A change within the response URL invocation (log)
[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 a52ff5baf1a755f29e8fa90ace02576856551742 (origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f a52ff5baf1a755f29e8fa90ace02576856551742
Commit message: "Started from merge-base when posting reviews."
 > git rev-list 8ef59ed50a8ce19383c7b52ad1dd6c1d93218021 # timeout=10
 > git tag -a -f -m Jenkins Build #21613 jenkins-Mesos-Reviewbot-21613 # 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/jenkins193560971544832106.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 #21614

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See <https://builds.apache.org/job/Mesos-Reviewbot/21614/display/redirect?page=changes>