code review for 6722460 and 6666204

[Dina]

All,

I would like a code review of

6722460 finish moving /dev/random and /dev/urandom seeding and usage to 
libcryptoutil
6666204 meta slot opens and closes /dev/urandom needlessly for every read
        
The webrev is at http://cr.opensolaris.org/~dinak/random-hg

Please comment by Wednesday, Aug 27 2008.

Thanks,
D.