RFR: 8373676: Test javax/net/ssl/HttpsURLConnection/SubjectAltNameIP.java fails on a machine without IPV6 [v2]

[Matthias Baesken]

> We have a Linux machine with IPV6 disabled.
> There the test javax/net/ssl/HttpsURLConnection/SubjectAltNameIP.java fails.
> Error is
> 
> java.lang.RuntimeException: Server failed to start.
> at SubjectAltNameIP.doClientSide(SubjectAltNameIP.java:139)
> at SubjectAltNameIP.<init>(SubjectAltNameIP.java:189)
> at SubjectAltNameIP.main(SubjectAltNameIP.java:176)
> at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
> at java.base/java.lang.reflect.Method.invoke(Method.java:565)
> at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
> at java.base/java.lang.Thread.run(Thread.java:1516)
> Caused by: java.net.SocketException: Protocol family unavailable
> 
> 
> After looking into the test, it turned out the IPV6 address `::1`  was passed in the notion `[::1] `to the isIPv6LiteralAddress, but this method must get the address without '[' and ']' .
> Additionally I adjusted the exception a bit so that it directly mentions IPV6 and not just some 'protol family' .

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  remove net_util_md.c changes, we'll do this in a separate issue

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28825/files
  - new: https://git.openjdk.org/jdk/pull/28825/files/d288299f..c8c73e4b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28825&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28825&range=00-01

  Stats: 8 lines in 1 file changed: 0 ins; 6 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/28825.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28825/head:pull/28825

PR: https://git.openjdk.org/jdk/pull/28825