[crac] RFR: 8368570: [CRaC] Improve JdwpTransportTest [v2]

[Roman Marchenko]

> JdwpTransportTest sometimes hangs, so it'd be good to dump Java threads, and create a corefile if possible.
> 
> Also improved reading from output stream.

Roman Marchenko has updated the pull request incrementally with two additional commits since the last revision:

 - Update test/lib/jdk/test/lib/crac/CracProcess.java
   
   fix grammar
   
   Co-authored-by: Timofei Pushkin <pushkin.td at gmail.com>
 - Update test/jdk/jdk/crac/jdwp/JdwpTransportTest.java
   
   fix copyright
   
   Co-authored-by: Timofei Pushkin <pushkin.td at gmail.com>

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

Changes:
  - all: https://git.openjdk.org/crac/pull/265/files
  - new: https://git.openjdk.org/crac/pull/265/files/c4fede95..9573ebf9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=265&range=01
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=265&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/crac/pull/265.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/265/head:pull/265

PR: https://git.openjdk.org/crac/pull/265