RFR: 7539: JDP Tests failing in VPN environments [v3]

[Johannes Bechberger]

> Only run broadcasting related tests when supported.
> Tested on Mac M1 with and without VPN.

Johannes Bechberger has updated the pull request incrementally with one additional commit since the last revision:

  Formatting

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/369/files
  - new: https://git.openjdk.java.net/jmc/pull/369/files/a50e543f..f902747c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=369&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=369&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jmc/pull/369.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/369/head:pull/369

PR: https://git.openjdk.java.net/jmc/pull/369