RFR: JDK-8268133 : Update java/net/Authenticator tests to eliminate dependency on sun.net.www.MessageHeader and some other internal APIs [v2]

[Mahendra Chhipa]

> …ency on sun.net.www.MessageHeader and

Mahendra Chhipa has updated the pull request incrementally with one additional commit since the last revision:

  Implemented tge review comments.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4317/files
  - new: https://git.openjdk.java.net/jdk/pull/4317/files/b3b1eff7..34d1e44d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4317&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4317&range=00-01

  Stats: 8 lines in 1 file changed: 0 ins; 3 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4317.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4317/head:pull/4317

PR: https://git.openjdk.java.net/jdk/pull/4317