[9] RFR 8137174: NTLM impl should use doPrivileged when it reads system properties

[Artem Smotrakov]

Hello,

Please review this small fix which updates NTLM implementation to use 
doPrivileged() methods when it reads system properties. Currently it 
requires property permissions to read "ntlm.debug" and "ntlm.version" 
system properties. Also added a test which runs NTLM auth if security 
manager is set.

Webrev: http://cr.openjdk.java.net/~asmotrak/8137174/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8137174

Artem