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

[Koichi Sakata]

> 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

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1685/files
  - new: https://git.openjdk.java.net/jdk/pull/1685/files/e5ab2837..ed882ea4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1685&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1685&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1685.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1685/head:pull/1685

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