RFR: 8257872: UL: -Xlog does not check number of options [v2]

[Ioi Lam]

On Tue, 8 Dec 2020 23:59:54 GMT, Koichi Sakata <ksakata at openjdk.org> wrote:

>> In Unified Logging options can be specified up to four (`-Xlog[:[selections][:[output][:[decorators][:output-options]]]]`).
>> But it’s possible to specify options with more colons like `java -Xlog:::::`.
>> It’s better to show a message when more options are specified than maximum number.
>> 
>> By this PR a warning message is outputted when options are specified more than the max number.
>
> Koichi Sakata has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Change the warning message

Agree that warning is OK.

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Marked as reviewed by iklam (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1685