RFR: 8240903: Add test to check that jmod hashes are reproducible [v5]

[Dongbo He]

On Wed, 30 Mar 2022 01:55:30 GMT, Dongbo He <dongbohe at openjdk.org> wrote:

>> This creates a regression test for [JDK-8240734](https://bugs.openjdk.java.net/browse/JDK-8240734). This was once blocked 
>> by a time stamp issue which has been resolved by: [JDK-8276766 ](https://bugs.openjdk.java.net/browse/JDK-8276766)
>> 
>> We found the issue can be produced stably with at least 64 modules.
>> Note that we need to add the --date jmod option to avoid the timestamp issue.
>> 
>> Testing:
>> Added test case fails without fix for JDK-8240734, and passes otherwise.
>> Tested with tier2 on linux x86.
>
> Dongbo He has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:
> 
>  - Merge branch 'master' into 8240903
>  - Delete extra blank links
>  - Change shell test io java test
>  - Get date by 'date +%Y-%m-%dT%H:%M:%S%:z'
>  - Update Copyright
>  - 8240903: Add a regression test for JDK-8240734

Thank you for your review, Alan.

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PR: https://git.openjdk.java.net/jdk/pull/7948