block/deadline: tweak for better android performance

Change-Id: Ie3f9f76cbde113b7dd6bb654ae47a41376b2aa21
Lock initial TCP window size to 64k (Improves network ping and output)
Optimize apply_slack() for size and speed -- http://lkml.indiana.edu/hypermail/linux/kernel/1201.3/03172.html
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
Optimized SLUB