RFR: 7903373: Add ability to customize test execution using main wrapper plugin

[Jonathan Gibbons]

On Fri, 28 Oct 2022 23:23:26 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> The fix adds support of a plugin that customizes test execution.
>
> src/share/classes/com/sun/javatest/regtest/agent/CustomMainWrapper.java line 105:
> 
>> 103:         return vmOpts;
>> 104:     }
>> 105: }
> 
> Is this real code, or just toy test code?

It loos like it is just test code, included from the new test, in which case it doesn't belong here in the mainline source.

> src/share/classes/com/sun/javatest/regtest/config/RegressionParameters.java line 1248:
> 
>> 1246: 
>> 1247:     private long timeoutHandlerTimeout;
>> 1248:     //---------------------------------------------------------------------
> 
> You have not updated `load` and `save` in this class

Are these methods actually being called?   You seem to be stashing the custom main wrapper values early in the `testVMOpts`

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PR: https://git.openjdk.org/jtreg/pull/136