[8u] RFR 8151788: NullPointerException from ntlm.Client.type3

[Zhengyu Gu]

Hi,

I would like to backport this patch to 8u, as Oracle parity.

The original patch applies cleanly after file path change. However, I 
modified the new test, removed its @modules annotation.

Original bug: https://bugs.openjdk.java.net/browse/JDK-8151788
Original patch: http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/3b503af253a4


8u Webrev: http://cr.openjdk.java.net/~zgu/JDK-8151788-8u/webrev.00/

Test:
   New test on Linux x86_64


Thanks,

-Zhengyu