Network:- Defer the systemd-networkd restart

[ratagupt]

It is agreed on that instead of starting the systemd-networkd for each network operation,we would defer it for some time.
There are two approaches

1. we would wait for a certain amount of time and cache all the changes and then restart the systemd-networkd.
2. one more dbus method say "apply Changes".which will apply all the changes and restart the systemd-networkd.
   Need to look at the pros and cons of both approaches.

[ratagupt]

It is not a code review defect,It is enhancement.

[ratagupt]

As discussed we will go with the approach 1

• Implement the timer which is already there.

• Start the timer whenever we get any dbus request,Need to make sure that only start the timer if it is not started.

• Once timer expired then restart the systemd-networkd.

[rfrandse]

https://gerrit.openbmc-project.xyz/6844 Reducing the restart of systemd-networkd by implementing timers
Resolves #2227 Network:- Defer the systemd-networkd restart

[sivassrr]

Not seeing much impact to existing network TCs. We need to rerun and do regression test. @prkatti1 FYI .