RFR: 8295777: java/net/httpclient/ConnectExceptionTest.java should not rely on system resolver

[Daniel Jeliński]

This PR makes ConnectExceptionTest use a non-existent hosts file for name resolution.

The test verifies that the HttpClient throws a ConnectException in response to DNS resolution failures. Slow name resolution makes this test take more time to complete. With this patch applied, the test becomes independent from external DNS services.

The test continues to pass.

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Commit messages:
 - Better handle dead DNS server

Changes: https://git.openjdk.org/jdk/pull/10811/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10811&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295777
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/10811.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10811/head:pull/10811

PR: https://git.openjdk.org/jdk/pull/10811