RFR: 8279351: [TESTBUG] SADebugDTest.java does not handle "Address already in use" error [v2]

[Yasumasa Suenaga]

> We expect SADebugDTest.java will retly the test when it encounters "Address already in use" error. However RuntimeException is thrown when the error happens.
> 
> So I fixed it with some refactoring in this PR. Key change is the condition in L129.
> 
> Please see serviceability-dev post for details.
> https://mail.openjdk.java.net/pipermail/serviceability-dev/2021-December/040453.html

Yasumasa Suenaga has updated the pull request incrementally with one additional commit since the last revision:

  Fix comments

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6941/files
  - new: https://git.openjdk.java.net/jdk/pull/6941/files/a20c362f..cf821c23

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6941&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6941&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6941.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6941/head:pull/6941

PR: https://git.openjdk.java.net/jdk/pull/6941