units: increase watchdog timeout to 3min for all our services Apparently, disk IO issues are more frequent than we hope, and 1min waiting for disk IO happens, so let's increase the watchdog timeout a bit, for all our services. See #1353 for an example where this triggers.

units: order networkd after sysctl This way networkd will correctly and race-freely inherit the default settings applied by sysctl. Suggested in issue #468.

turn kdbus support into a runtime option ./configure --enable/disable-kdbus can be used to set the default behavior regarding kdbus. If no kdbus kernel support is available, dbus-dameon will be used. With --enable-kdbus, the kernel command line option "kdbus=0" can be used to disable kdbus. With --disable-kdbus, the kernel command line option "kdbus=1" is required to enable kdbus support.

units: make networkd pull in its own .busname unit The daemon requires the busname unit to operate (on kdbus systems), since it contains the policy that allows it to acquire its service name. This fixes https://bugs.freedesktop.org/show_bug.cgi?id=90287