Build failed in Jenkins: brooklyn-dist-master-docker #103

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See <https://builds.apache.org/job/brooklyn-dist-master-docker/103/display/redirect>

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Started by timer
[EnvInject] - Loading node environment variables.
Building remotely on ubuntu-4 (ubuntu trusty) in workspace <https://builds.apache.org/job/brooklyn-dist-master-docker/ws/>
[WS-CLEANUP] Deleting project workspace...
[WS-CLEANUP] Done
Cloning the remote Git repository
Cloning repository https://git-wip-us.apache.org/repos/asf/brooklyn-dist.git
 > git init <https://builds.apache.org/job/brooklyn-dist-master-docker/ws/> # timeout=10
Fetching upstream changes from https://git-wip-us.apache.org/repos/asf/brooklyn-dist.git
 > git --version # timeout=10
 > git fetch --tags --progress https://git-wip-us.apache.org/repos/asf/brooklyn-dist.git +refs/heads/*:refs/remotes/origin/*
 > git config remote.origin.url https://git-wip-us.apache.org/repos/asf/brooklyn-dist.git # timeout=10
 > git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/* # timeout=10
 > git config remote.origin.url https://git-wip-us.apache.org/repos/asf/brooklyn-dist.git # timeout=10
Fetching upstream changes from https://git-wip-us.apache.org/repos/asf/brooklyn-dist.git
 > git fetch --tags --progress https://git-wip-us.apache.org/repos/asf/brooklyn-dist.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse origin/master^{commit} # timeout=10
Checking out Revision eab0701f0ab0521c0b777808621c16e928e42783 (origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f eab0701f0ab0521c0b777808621c16e928e42783
Commit message: "make change-version script run in selected dot files like .mvn"
 > git rev-list --no-walk eab0701f0ab0521c0b777808621c16e928e42783 # timeout=10
Run condition [Current build status] enabling prebuild for step [Execute shell]
[brooklyn-dist-master-docker] $ /bin/bash -xe /tmp/jenkins6737170774683373704.sh
+ mkdir -p .m2
[brooklyn-dist-master-docker] $ /bin/bash -xe /tmp/jenkins9073728735873477770.sh
+ docker build -t brooklyn:dist .
Sending build context to Docker daemon  3.492MB
Step 1/2 : FROM maven:3.5.2-jdk-8-alpine
Get https://registry-1.docker.io/v2/library/maven/manifests/3.5.2-jdk-8-alpine: received unexpected HTTP status: 503 Service Unavailable
Build step 'Execute shell' marked build as failure
Recording test results
ERROR: Step ?Publish JUnit test result report? failed: No test report files were found. Configuration error?
TestNG Reports Processing: START
Looking for TestNG results report in workspace using pattern: **/testng-results.xml
Did not find any matching files.

Jenkins build is back to normal : brooklyn-dist-master-docker #104

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See <https://builds.apache.org/job/brooklyn-dist-master-docker/104/display/redirect>