** Description changed:

- networkd add support for Bridge Priority, AgeingTimeSec and DefaultPVID
+ [Impact]
+ Newer releases of networkd support more optional settings for Bridge 
Priority, AgeingTimeSec and DefaultPVID.
  
- cherrypick these settings for better supportability of networkd on
- xenial with netplan.
+ 
https://www.freedesktop.org/software/systemd/man/systemd.netdev.html#AgeingTimeSec=
+ https://www.freedesktop.org/software/systemd/man/systemd.netdev.html#Priority=
+ 
https://www.freedesktop.org/software/systemd/man/systemd.netdev.html#DefaultPVID=
+ 
+ Backporting these features to xenial, allows to use/set these options
+ via netplan for any releases as for example deployed by MAAS.
+ 
+ [Fix]
+ cherrypick these settings for better supportability of networkd on xenial 
with netplan.
+ 
+ [Testcase]
+ 1) Create .netdev bridge device
+ 2) Specify Priority, AgeingTimeSec, DefaultPVID settings in the [Bridge] 
section
+ 3) Verify that there are no parsing errors in journalctl from systemd-netword
+ 4) Verify with `ip` command that the bridge device got created
+ 5) Verify in sysfs that the settings requested have been applied to the device
+ 
+ [Regression]
+ These stanazas are optional, and will be ignored by older networkd if for 
example users start using them, and downgrade networkd to the one in release 
pocket. It is future compatible settings that will not cause upgrade issues, 
nor could result in failure to create the bridge device.

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https://bugs.launchpad.net/bugs/1715131

Title:
  networkd add support for Bridge Priority, AgeingTimeSec and
  DefaultPVID

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