livepatch: change to a per-task consistency model

[Jiri Kosina]

On Wed, 18 May 2016, Josh Poimboeuf wrote:

> Yeah, I think this situation -- a task sleeping on an affected function 
> in uninterruptible state for a long period of time -- would be 
> exceedingly rare and not something we need to worry about for now.

Plus in case task'd be in TASK_UNINTERRUPTIBLE for more than 120s, hung 
task detector would trigger anyway.

-- 
Jiri Kosina
SUSE Labs