RFR [14] 8235976: Directives in WWW-Authenticate should be comma separated

[Michael McMahon]

Could I get the following small fix reviewed please?

It is a followup to 8199849 which is already in 14.
The fix did not include the required comma separator between parameters
in HTTP response authentication headers.

http://cr.openjdk.java.net/~michaelm/8235976/webrev.1/

Thanks,

Michael.