RFR: 8153213: Jar manifest attribute "Multi-Release" accepts any value

[Steve Drach]

Hi,

Please review this simple fix to require that the jar manifest Multi-Release attribute has a value of “true" in order to be effective, i.e. to assert the jar is a multi-release jar.

issue: https://bugs.openjdk.java.net/browse/JDK-8153213 <https://bugs.openjdk.java.net/browse/JDK-8153213>
webrev: http://cr.openjdk.java.net/~sdrach/8153213/webrev/index.html <http://cr.openjdk.java.net/~sdrach/8153213/webrev/index.html>

Thanks
Steve