RFR: 8034170: Digest authentication interop issue

[Michael McMahon]

Could I get the following change reviewed please for JDK 9
(same change will apply later to 8u-dev)?

In JDK 8 we fixed a problem with Digest authentication
where some parameters were being enclosed in double quotes
incorrectly. It seems some old versions of Tomcat expect this
behavior. So, the fix is to provide a flag that restores the old
behavior. The (qop and algorithm parameters are affected)

http://cr.openjdk.java.net/~michaelm/8034170/webrev.1/

Thanks
Michael