RFR: 8303392: Runtime.exec and ProcessBuilder.start should use System logger [v6]

[Roger Riggs]

> Runtime.exec and ProcessBuilder.start methods create a new operating system process with the program and arguments. Many applications configure a logging subsystem to monitor application events. Logging a process start message with the program, arguments, and stack trace can identify the caller and purpose.
> Logging the process start event is complementary to the process start event generated for JFR (Java Flight Recorder).

Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:

  Reword @implNote to indicate logging can be enabled. (But is not by default)

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12862/files
  - new: https://git.openjdk.org/jdk/pull/12862/files/a073cc8d..47c3ab63

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12862&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12862&range=04-05

  Stats: 7 lines in 2 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/12862.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12862/head:pull/12862

PR: https://git.openjdk.org/jdk/pull/12862