RFR: JDK-8136777: Introduce bundle targets

[Tim Bell]

Erik:

> This change introduces bundle targets for the OpenJDK build, which 
> creates the same tar.gz and zip bundles as the full OracleJDK build 
> does today. The motivation for this is to have one place where this 
> happens, in a part of the build that is always being built by all our 
> configurations.
>
> This adds a new top level target all-bundles (or just bundles for 
> short). There are also sub targets product-bundles, test-bundles and 
> docs-bundles.
>
> The Jib profiles have been updated to use the bundle targets as defaults.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8136777
> Webrev: http://cr.openjdk.java.net/~erikj/8136777/webrev.01/

Looks good to me.

/Tim