RFR 8005638: Less secure Authentication schemes should work when more secure schemes are not available

[Chris Hegarty]

With compact profiles imminent, see http://openjdk.java.net/jeps/161, 
more heavy weight HTTP authentication schemes, like NTLM, Kerberos, 
Negotiate, may not be in the smaller profiles. In such cases the HTTP 
client, HttpURLConnection, should use the most secure scheme advertised 
by the server, and also supported by the running JRE. This seems to work 
with Kerberos and Negotiate, but there is an issue with NTLM.

http://cr.openjdk.java.net/~chegar/8005638/webrev/
Also, a test to verify this all works as expected has been added. It 
could be cleaned up somewhat when a standard way to determine the 
profile has been added ( but this is not critical ).

-Chris.