RFR: 8273101: Eliminate the usage of threadgroup sandboxing in the java.util.logging

[Phil Race]

On Wed, 1 Sep 2021 06:31:16 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> The "java.util.logging.LogManager" class uses the "threadgroup sandboxing" via an AppContext to support "applet logging isolation". The AppContext class became useless since the plugin and webstart are no longer supported and removed in jdk11.
> 
> This is the request to delete the usage of AppContext in the LogManager and related tests.
> 
> Tested by tier1/tier2/tier3 and jdk_desktop tests.

@aivanov-jdk will help make sure the closed changes are pushed at exactly the same time as this gets pushed.

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PR: https://git.openjdk.java.net/jdk/pull/5326