Issue #438 Populate "git.branch" and "git.build.number" for Azure DevOps

[dandragut]

Context

Populate "git.branch" and "git.build.number" for Azure DevOps

2019-10-01T09:20:52.8249155Z BUILD_BUILDNUMBER=20191001.1
2019-10-01T09:20:52.8249357Z BUILD_SOURCEBRANCHNAME=74902_build_info-and-pipelines_v3
...
2019-10-01T09:21:01.5141375Z [INFO] Collected git.build.number with value 20191001.1
...
2019-10-01T09:21:00.9696385Z [INFO] Using environment variable based branch name. BUILD_SOURCEBRANCHNAME = 74902_build_info-and-pipelines_v3
2019-10-01T09:21:00.9747110Z [INFO] Collected git.branch with value 74902_build_info-and-pipelines_v

Contributor Checklist

• Added relevant integration or unit tests to verify the changes
• Update the Readme or any other documentation (including relevant Javadoc)
• Ensured that tests pass locally: mvn clean package
• Ensured that the code meets the current checkstyle coding style definition: mvn clean verify -Pcheckstyle -Dmaven.test.skip=true -B

[TheSnoozer]

Thank you for your contribution!

Based on you log message I assume you have tested your changes with a local version of the plugin and it seemed to have worked. The changes look good for me. I'm going ahead and merge this without any additional testing - at least travis does not complain so it should be fine.

Thanks again for your work on getting this plugin improved!