Bug#924132: runit: Add support for runit in init-system-helpers

[Lorenzo]

Dear init-system-helpers maintainers,

> Now it's likely that I have to support also a catch-all package for
> runit services in addition to the standard dh-runit code

such support is now done, so I'm attaching an updated patchset:

* no patch is needed for update-rc.d: the rescan need to happen
  between enable and signal to a service; both actions are handled
  by runit-helper, so a rescan in update-rc.d is not useful.

* invoke-rc.d: what is needed is a way to block invoke-rc.d when
  a native runit service is found, so that duplicated and conflicting
  instances are avoided. I've added an override mechanism.

* service: patch updated for new service layout; also --status-all
  is changed so that runscripts status is distinguishable from the
  sysv status (runit currently uses a mix of native and sysv scripts
  so the distinction is useful)

Regards,
Lorenzo
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