Add an ALRM timer to cope with 2 annoying issues in rc.d(8):

- prevent a daemon from hanging the boot
(typo in your flagsm e.g. httpd_flags=-d)
- make sure we can get the status of a backgrounded daemon instead of always
returning success

Side effect of this is that we can kill a knob! rip rc_bg :-)
Ports will need love, and a second commit is coming for that.

The diff is small yet not trivial so I am committing early in the release
process in one shot so it can easily be reverted if needed. I started working on
this during g2k16 in Cambridge then finished it in Brisbane for a2k17 where
robert@, beck@ and sthen@ agreed it was the correct way to go and I should move
ahead with it post 6.1.

If you see any regression, please talk to me!

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