random: entropy tweaks are all the rage nowadays

use nonblocking for all.  Read this web page:
http://lwn.net/Articles/489734/ - WIP

commit d19e78c01870bc32e40862b50881bb30fe046933 1 parent 709ec23
maxl authored a day ago voku committed in 12 hours
Disabled NIGHTMARE GOV, till alucard can make it more stable.
users report SODS and HOTBOOTS including me.

and some info about voltage table that is used.