RFR: 6913: Add daemon thread information to the console threads view

Mon Sep 28 12:02:00 UTC 2020

I had an Java application which did not exit because of a non-daemon thread still running. Therefore I added a column
to the treads view that displays if a thread is a daemon thread or not.

oca: has been signed on 2019-01-17 (got positive response from Dalibor Topic on 2019-01-23).

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Commit messages:
 - code formatting
 - Threads view: "deamon" column added

Changes: https://git.openjdk.java.net/jmc/pull/110/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=110&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6913
  Stats: 11 lines in 4 files changed: 10 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jmc/pull/110.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/110/head:pull/110

PR: https://git.openjdk.java.net/jmc/pull/110