RFR: 8271419: Refactor test code for modifying CDS archive contents [v4]

[Calvin Cheung]

On Mon, 2 Aug 2021 19:39:08 GMT, Yumin Qi <minqi at openjdk.org> wrote:

>> The code for modifying CDS archive content could be used by other tests so the common code is refactored into a util class CDSArchiveUtils.
>> 
>> Tests: tier1,tier4
>> 
>> Thanks
>> Yumin
>
> Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove Utils from import

Marked as reviewed by ccheung (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/4945