Request for Review 6882654

[Christopher Hegarty - Sun Microsystems Ireland]

6882654: Remove dependency on java.util.concurrent from KeepAlive 
implementaion

Webrev:
   http://cr.openjdk.java.net/~chegar/6882654/webrev.0/webrev/

The HTTP keep alive implementation has unnecessary dependencies on 
java.util.concurrent classes.

KeepAliveCache subclasses ConcurrentHashMap even though all its methods 
are synchronized, except run with synchronizes on the this object before 
attempting to access and of the classes data.

KeepAliveStreamCleaner subclasses LinkedBlockingQueue, but we can easily 
rewrite it since it only uses a simple timed poll.

-Chris.