RFR: JDK-8262899: TestRedirectLinks fails

[Jonathan Gibbons]

Please review a trivial change to fix this test when run behind a firewall with a proxy set.

Previously, the test used `InetAddress.getLocalHost` which returns an IP address for the current host.  It runs a temporary local web server on that address, but since the address is typically not on the `nonProxyHosts` list, the attempted access to the web server goes to the proxy, and fails.

The fix is to explicitly use `127.0.0.1`, which should never go to a proxy, if one is set.

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Commit messages:
 - JDK-8262899: TestRedirectLinks fails

Changes: https://git.openjdk.java.net/jdk/pull/3137/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3137&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262899
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3137.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3137/head:pull/3137

PR: https://git.openjdk.java.net/jdk/pull/3137