RFR: JDK-8075056 Remove Version.java.template from jconsole

[Staffan Larsen]

The build for jconsole currently takes a template file and inserts the version number of the build into the file. We can simplify this by removing the template file and reading the java.runtime.version system property at runtime.

bug: https://bugs.openjdk.java.net/browse/JDK-8075056
webrev: http://cr.openjdk.java.net/~sla/8075056/webrev.00/ <http://cr.openjdk.java.net/~sla/8075056/webrev.00/>

Thanks,
/Staffan