init-system-helpers: upgrade 1.65.2 -> 1.66

init-system-helpers: upgrade 1.65.2 -> 1.66

Changelog:
==========
* d/init.lintian-overrides: Silence warning about "Important" field
  'Important: yes' instructs APT to warn the user before removing this
  package.
* script/update-rc.d: DPKG_ROOT support for sysvinit
* Add "Protected: yes" to package "init" The "Protected" field does the
  same as "Important" already did in apt, but is also understood by dpkg
  (since dpkg 1.20.1).
* Bump Standards-Version to 4.6.2, no changes
* Override Lintian warning for Protected: yes
* deb-systemd-invoke: support reload/reexec. This is useful for the
  --user case, to provide a shortcut that loops over all active user
  sessions over D-Bus.
* deb-systemd-invoke: support --no-dbus for reload/reexec. Provide
  common implementation for SIGHUP/SIGRTMIN+25 to reload/reexec the
  system or user instances.

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>