RFR: 6982: CoreLibs: Add license and TPL info to sources and javadocs

[Marcus Hirt]

On Mon, 23 Nov 2020 06:16:53 GMT, Guru Hb <ghb at openjdk.org> wrote:

> Adding "LICENSE.txt" and "THIRD_PARTY_LICENSES.txt" for "*-{source, javadoc}.jar" in core libraries.
> 
> Note: "maven-source-plugin" doesn't have capability to add resource outside the project directory. Added "org.codehaus.mojo:build-helper-maven-plugin" for copying license for the *-source.jar.

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/164