Add support for scalatest-maven-plugin test results.
[maven-release-plugin] prepare release jenkins-1.516
[maven-release-plugin] prepare for next development iteration
updated changelog for release
updated changelog as a part of the release
merged back the RC branch
Merge pull request #794 from roadrunner2/scalatest-maven-plugin-support-v3

[FIXED JENKINS-18086] Add support for scalatest-maven-plugin test results.
Note changes for JENKINS-18086
Merge branch 'master' of https://github.com/jenkinsci/jenkins