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

[Aleksey Shipilev]

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

Thanks all!

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