RFR: 8287398: Allow concurrent execution of hotspot docker tests [v2]

[Ioi Lam]

On Fri, 27 May 2022 19:56:59 GMT, Mikhailo Seledtsov <mseledtsov at openjdk.org> wrote:

>> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   updated Common.imageName() to generate unique names
>
> Looks good to me, thanks.

Thanks @mseledts @shipilev @jerboaa for the review.

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PR: https://git.openjdk.java.net/jdk/pull/8914