RFR: 8273921: Refactor NSK/JDI tests to create thread using factory [v4]

[Leonid Mesnik]

> 8273921: Refactor NSK/JDI tests to create thread using factory

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

  Renamed JDITask to NamedTask.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5515/files
  - new: https://git.openjdk.java.net/jdk/pull/5515/files/2bf3f3c0..e8341380

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5515&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5515&range=02-03

  Stats: 413 lines in 199 files changed: 0 ins; 181 del; 232 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5515.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5515/head:pull/5515

PR: https://git.openjdk.java.net/jdk/pull/5515