Added the ability to label a build scan

[lschwahn]

This PR adds the ability to optionally label a build scan. This is useful when a jenkins job creates multiple build scans.

What we have changed:

• New option for Gradle-BuildStep in FreeStyle-Jobs.
• New optional Parameter for "findBuildScans" ("buildScanLabel").
• New optional Parameter for "withGradle" ("buildScanLabel").
• Added and changed tests.
• Added documentation.

Our Solution is backwards compatible.

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[wolfs]

Hi @lschwahn, thank you for your pull request! Given that quite some time has passed, are you still interested in this feature?

[lschwahn]

Hi @wolfs, yes we are still interested in this feature. We are using it in our productive Jenkins-Environment.

edit: I just rebased this PR and fixed some conflicts

[wolfs]

@lschwahn The Gradle plugin 2.3 adds Enriched build scans. Is that already enough for your use-case or would you still want to have additional labels for the scans.

[lschwahn]

@wolfs Thanks for the hint. These Enriched build scans seem to solve our problem. Closing this PR.