RFR: 8330278: Have SSLSocketTemplate.doClientSide use loopback address

[Sean Coffey]

Using the loopback address by default may prove more reliable for some test configurations

ran all jdk_security tests. no issues seen.

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/19083/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19083&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330278
  Stats: 4 lines in 2 files changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/19083.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19083/head:pull/19083

PR: https://git.openjdk.org/jdk/pull/19083