RFR 7129083: CookieManager does not store cookies if url is read before setting cookie manager

[Chris Hegarty]

The system-wide CookieHandler is read and stored in the 
sun.net.www.http(s) HttpClient/HttpsClient instance. Since this 
HttpClient/HttpsClient instance is cached and reused (where possible) as 
part of the persistent/keep-alive connection implementation, it will not 
reflect any changes made to the default system-wide CookieHandler after 
it is created.

It is unspecified what effect changing the system-wide CookieHandler 
will have on the HTTP Client, but is seems reasonable that the two parts 
of the HTTP Client implementation, HttpURLConnection and HttpClient, 
should use the same CookieHandler. HttpClient should use the instance 
specific (most recently retrieved system-wide CookieHandler) from 
HttpURLConnection.

http://cr.openjdk.java.net/~chegar/7129083/webrev.00/webrev/

-Chris.