RFR: 8273187: jtools tests fail with missing markerName check

[Naoto Sato]

Fixing failing regression tests caused by the JEP 400: UTF-8 by Default.

`JcmdOutputEncodingTest` test case uses `file.encoding=UTF-8` in `C` locale. The output from the agent library is in `UTF-8` so it succeeded before the JEP has been implemented, as System.out used `UTF-8` converter. After the JEP, it started failing because System.out is using `US-ASCII` which generates series of '?', ending up with assertion failure in the test.

The proposed fix is to pass `sun.stdout.encoding=UTF-8` as well as `file.encoding` so that tool process' System.out is in `UTF-8` as well.

-------------

Commit messages:
 - Merge branch 'master' into JDK-8273187
 - Reverted command encoding, then modified the test case to use sun.stdout.encoding
 - Used `transferTo()`
 - Merge branch 'master' into JDK-8273187
 - Nuked UTF-8 conversion in tools
 - Merge branch 'master' into JDK-8273187
 - 8273187: jtools tests fail with missing markerName check

Changes: https://git.openjdk.java.net/jdk/pull/5539/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5539&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273187
  Stats: 10 lines in 3 files changed: 3 ins; 4 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5539.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5539/head:pull/5539

PR: https://git.openjdk.java.net/jdk/pull/5539