[JENKINS-38018] Preparing for release#137

Merged

jglick merged 2 commits intojenkinsci:masterfrom

jglick:release-JENKINS-38018

May 11, 2018

Commits on May 11, 2018

Test added in #63 was nondeterministic: the `latest` tag can float. Passes with 3.5.x, fails with 3.3.x.
jglick
committed
Updates, incl. picking up release of https://github.com/jenkinsci/docker-commons-plugin/pull/67 (#133 was merged without this).
jglick
committed