RFR: JDK-8262899: TestRedirectLinks fails [v4]

[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.

Jonathan Gibbons has updated the pull request incrementally with one additional commit since the last revision:

  Disable problem test case by default, unless enabled by system property

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3137/files
  - new: https://git.openjdk.java.net/jdk/pull/3137/files/89f54427..6901c1c4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3137&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3137&range=02-03

  Stats: 12 lines in 1 file changed: 11 ins; 0 del; 1 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