RFR: 6000: Get rid of build warnings in the JMC agent

[Marcus Hirt]

On Tue, 4 Aug 2020 01:10:37 GMT, Guru Hb <ghb at openjdk.org> wrote:

> Solution : excluded "module-info.class" and META-INF/MANIFEST.MF (maven-shade-plugin has detected that some class files
> are present in two or more jars). for below warnings
> 
> [WARNING] Discovered module-info.class. Shading will break its strong encapsulation.

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/103