RFR: 7116: Update version to 8.1.0 in master [v3]

[Jie Kang]

On Fri, 22 Jan 2021 22:36:57 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Also cleaning up the maven versioning.
>
> Marcus Hirt has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Ignoring flattened poms
>  - Flattening poms

core/pom.xml line 274:

> 272: 			<plugin>
> 273: 				<groupId>org.codehaus.mojo</groupId>
> 274: 				<artifactId>flatten-maven-plugin</artifactId>

@thegreystone 
Can the flatten-maven-plugin also be used for jmc too? The artifacts produced for jmc-core look good now, but the ones produced for jmc have m2 pom files with ${revision}${changelist}.

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PR: https://git.openjdk.java.net/jmc/pull/206