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

[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).

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Commit messages:
 - 8303392: Runtime.exec and ProcessBuilder.start should use System logger

Changes: https://git.openjdk.org/jdk/pull/12862/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12862&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303392
  Stats: 200 lines in 4 files changed: 199 ins; 0 del; 1 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