RFR: 8293873: Centralize the initialization of UL

[Johan Sjölen]

On Fri, 16 Sep 2022 12:22:42 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> Hi,
> 
> May I please have a review of this change? It moves around some of the initialization code of UL to one place (namely `LogConfiguration::initialize`). It does not change how UL works after VM start up, and it should not change how UL works after VM shut down, but it might change how UL works before VM start up. I don't believe that this causes any breakage.
> 
> Tier 2 and 3 tests are currently running, all green so far.
> 
> Some more context is available at https://bugs.openjdk.org/browse/JDK-8293873

Some of these files haven't had their copyright years updated.

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PR: https://git.openjdk.org/jdk/pull/10307