[parent] Possibe change to moditect configuration for internal packages

[Alex Herbert]

The RNG component has an internal package. So to not export this in the
module info I had to tweak the exports for moditect inherited from commons
parent with a profile:

    <profile>
      <id>java-9-up</id>
      <activation>
        <jdk>[9,)</jdk>
      </activation>
      <build>
        <plugins>
          <plugin>
            <groupId>org.moditect</groupId>
            <artifactId>moditect-maven-plugin</artifactId>
            <version>${commons.moditect-maven-plugin.version}</version>
            <configuration>
              <module>
                <moduleInfo>
                  <exports>
                    !${commons.module.name}*.internal*;
                    *;
                  </exports>
                </moduleInfo>
              </module>
            </configuration>
          </plugin>
        </plugins>
      </build>
    </profile>

This could be integrated to commons parent. However it may affect binary
compatibility on Java 9+ for any that do and have been released with the
default export of all packages.

Are there any other components that use internal packages?

Alex