RFR: JDK-8230652: Improve verbose output

[Andy Herrick]

JDK-8230652
Extracting the commands displayed by verbose output (including commands called thru ToolProvider) , to contain the the
command, it's output, and it's return value on separate lines and formatted in a way that they can be easily cut and
pasted into a script.

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Commit messages:
 - JDK-8230652: Improve verbose output

Changes: https://git.openjdk.java.net/jdk/pull/141/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=141&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8230652
  Stats: 78 lines in 9 files changed: 42 ins; 25 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/141.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/141/head:pull/141

PR: https://git.openjdk.java.net/jdk/pull/141