RFR: 8265690: Use the latest Ubuntu base image version in Docker testing [v2]

[Igor Ignatyev]

On Thu, 22 Apr 2021 12:37:43 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Use latest Ubuntu base image to get latest glibc, so that host-built JDK has a higher chance to pass. Current "oraclelinux:7.6" image apparently has glibc 2.27. Please see the bug for more discussion.
>> 
>> Additional testing:
>>  - [x] `hotspot_containers` tests on Ubuntu 20.04 (glibc 2.31) -- used to fail, now passes
>>  - [x] `hotspot_containers` tests on Debian 9 (glibc 2.24) -- continues to pass
>>  - [x] `hotspot_containers` tests on Centos 7 (glibc 2.17) -- continues to pass
>
> Aleksey Shipilev 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 one additional commit since the last revision:
> 
>   8265690: Use latest Ubuntu base image version in Docker testing

Severin, thanks for bringing this to our attention.

As far as I can see, we explicitly specify `jdk.test.docker.image.(name|version)` properties in all Oracle testing, so the change impacts only local uses, and there it would seem to make it actually easier for people to use. with that being said, I'd like to get an OK from Misha (@mseledts) as he oversees our container testing.

Cheers,
-- Igor

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PR: https://git.openjdk.java.net/jdk/pull/3605