[jdk11u-dev] RFR: 8270290: NTLM authentication fails if HEAD request is used

[Alex Kasko]

Clean backport of NTLM fix, test is included.

Additional testing:

 - [x] checked that added test fails without the patch and passes with the patch
 - [x] ran jtreg:jdk/sun/net/www/protocol/http

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Commit messages:
 - Backport 3e0d7c33d41a93496bfa6a47d1508e415930adf9

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/666/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=666&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270290
  Stats: 307 lines in 2 files changed: 306 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/666.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/666/head:pull/666

PR: https://git.openjdk.java.net/jdk11u-dev/pull/666