RFR: 8254861: reformat code in vmTestbase/nsk/jdb [v2]

[Igor Ignatyev]

> Hi all,
> 
> could you please review this patch which reformats/cleans up the code of vmTestbase/nsk/jdb tests?
> 
> the part of this patch is a spinoff from #350.
> 
> testing:
> * [x] `vmTestbase/nsk/jdb` tests on `linux-x64-debug`

Igor Ignatyev has updated the pull request incrementally with one additional commit since the last revision:

  update copyright years

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/689/files
  - new: https://git.openjdk.java.net/jdk/pull/689/files/1b6fa98f..e43129d6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=689&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=689&range=00-01

  Stats: 64 lines in 64 files changed: 0 ins; 0 del; 64 mod
  Patch: https://git.openjdk.java.net/jdk/pull/689.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/689/head:pull/689

PR: https://git.openjdk.java.net/jdk/pull/689