HEADS UP: tunables for dsched have changed, serno support

[Alex Hornung]

Hi all,

Just a short heads-up: I've just committed another change to the loader
tunables for dsched. They now are named dsched.* instead of kern.dsched.*.
This is to use the same namespace as the dsched sysctl tree.

Dsched now also support sernos, e.g.:
dsched.policy.WD19339191 = "fq"

Cheers,
Alex Hornung