RFR: Shenandoah unified logging [v2]

[cfumiwu]

> Writing the Shenandoah log file to the log stream without creating a new stream for it.

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

  Fixing indenting problem

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Changes:
  - all: https://git.openjdk.org/shenandoah/pull/162/files
  - new: https://git.openjdk.org/shenandoah/pull/162/files/22dfc26a..5bdc1229

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=shenandoah&pr=162&range=01
 - incr: https://webrevs.openjdk.org/?repo=shenandoah&pr=162&range=00-01

  Stats: 15 lines in 1 file changed: 2 ins; 2 del; 11 mod
  Patch: https://git.openjdk.org/shenandoah/pull/162.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah pull/162/head:pull/162

PR: https://git.openjdk.org/shenandoah/pull/162