RFR: 8274318: Replace 'for' cycles with iterator with enhanced-for in java.management

[Chris Plummer]

On Sat, 25 Sep 2021 10:51:12 GMT, Andrey Turbanov <github.com+741251+turbanoff at openjdk.org> wrote:

> There are a few places in code, where manual `for` loop is used with Iterator to iterate over Collection.
> Instead of manual `for` cycles, it's preferred to use enhanced-for cycle instead: it's less verbose, makes code easier to read and it's less error-prone.
> It doesn't have any performance impact: javac compiler generates similar code when compiling enhanced-for cycle.
> Similar cleanups:
> 1. [JDK-8274016](https://bugs.openjdk.java.net/browse/JDK-8274016) java.desktop
> 2. [JDK-8274237](https://bugs.openjdk.java.net/browse/JDK-8274237) java.base
> 3. [JDK-8274261](https://bugs.openjdk.java.net/browse/JDK-8274261) jdk.jcmd

Marked as reviewed by cjplummer (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5695