This reverts commit 97aa3506.

This reverts commit c05fd6f1.

The "/usr/share/doc/chrony/chrony.txt.gz" file isn’t provided anymore.

The "/usr/share/doc/chrony/chrony.txt.gz" file isn’t provided anymore.

The time-sources-from-dhcp-servers test currently fails due to a testbed
issue on salsa CI.

Christian Ehrhardt authored Apr 18, 2018 and Vincent Blut committed Jan 04, 2019

This is reusing the already provided script for NetworkManager.
This script is not hard-tied to NetworkManager as it does not use
and of its provided environment variables.

OTOH the NM scripts are general scripts that are called on any change
and then differentiate between invocation reasons via the environment provided.
But the script for chrony is agnostic to the event types - it just checks if
servers are reachable and calls chronyc online/offline accordingly.

Therefore we just link this script into networkd-dispatcher events to work the
same way. Even if not setting servers offline via loosing an interface, but
instead e.g. using the auto_offline function of chrony and then configuring a
new device it will detect the servers as no-reachable and try to connect the
sources again.

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>

Debhelper compatibility level 12 makes use of the “--skip-systemd-native”
flag from “invoke-rc.d”. Adding Pre-Depends: ${misc:Pre-Depends} to d/control
ensure that we have a recent enough version of “init-system-helpers”.

etc/apparmor.d/tunables/sys file has been deprecated in AppArmor 2.13.1!
The @{sys} variable is now defined in “tunables/kernelvars” which is
included in “tunables/global”.

Update to upstream version '3.4'
with Debian dir 497df6e1ee196fc21f9c3eb6971d7ef225c9a843

This should fix FTBFS on HPPA and Alpha.

Thanks to this new command, we don’t need to check for a default route
anymore before switching between online and offline state.