RFR: 8334297: (so) java/nio/channels/SocketChannel/OpenLeak.java should not depend on SecurityManager [v2]

[Daniel Fuchs]

> The test java/nio/channels/SocketChannel/OpenLeak.java depends on the SecurityManager to trigger an exception in SocketChannel::connect.
> 
> This change rewrites it to connect to a TCP reserved port instead, such as port 47, 51, or 61, in order to trigger a `ConnectException` instead of a `SecurityException`.
> 
> The original issue that this test tried to check for was:
> https://bugs.openjdk.org/browse/JDK-6548464

Daniel Fuchs has updated the pull request incrementally with one additional commit since the last revision:

  Improve test for better coverage

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19723/files
  - new: https://git.openjdk.org/jdk/pull/19723/files/79ca2ef4..77fdcf41

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19723&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19723&range=00-01

  Stats: 30 lines in 1 file changed: 25 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/19723.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19723/head:pull/19723

PR: https://git.openjdk.org/jdk/pull/19723