RFR: 8077155: LoginContext Subject ignored by jdk8 sun.net.www.protocol.http.HttpURLConnection

[Rob McKenna]

Hi folks,

Looking for a review of this webrev:

http://cr.openjdk.java.net/~robm/8077155/webrev.01/

Basically the subjects credentials are not available to 
HttpURLConnection.getInputStream0 since it now runs in a doPrivileged 
block. Changing that to doPrivilegedWithCombiner allows getInputStream0 
access to the AccessControlContext's DomainCombiner and the subjects 
associated credentials.

	-Rob