RFR: 6913: Add daemon thread information to the console threads view [v3]

[Jan S.]

> 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).

Jan S. has updated the pull request incrementally with one additional commit since the last revision:

  message text corrected as requested

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/110/files
  - new: https://git.openjdk.java.net/jmc/pull/110/files/c864b4be..cf4a0fc5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=110&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=110&range=01-02

  Stats: 1 line in 1 file changed: 0 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