Add file trigger on /usr/lib/sysctl.d to apply new configuration

Ben Hutchingsrequested to merge
benh/procps:sysctl-trigger into master

As discussed in Debian bug #1088203, sysctl configuration files should be applied on installation and upgrade. Add a file trigger to make this happen by running sysctl --system, subject to certain conditions.

The conditions are:

  • The init system must not be systemd; it will be adding its own file trigger and we don't want to do the same thing again.
  • /proc/sys must be available.
  • We must not be running in a chroot, as we would then wrongly override the outer system.
  • We must not be running in a container, as many sysctls will not be writable and we don't know how to handle that.

Closes: #1088203

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