Code review request for 7049774

[Seán Coffey]

7049774 : UID construction appears to hang if time changed backwards

I'm looking for code review of above reported issue. If system clock goes
backwards on rmi server with active clients and 64k UID boundary is hit,
the server will wait until system  time progresses past the time at 
which UID class
was instantiated.

Fix is to not to use earlier times for such corner cases.

bug ID should become public on bugs.sun.com over coming day.

webrev : http://cr.openjdk.java.net/~coffeys/webrev.7049774.0/

Regards,
Sean.