[Bug 1715131] Re: networkd add support for Bridge Priority, AgeingTimeSec and DefaultPVID

[Dimitri John Ledkov]

checked with 229-4ubuntu20 aging and priority parsed and set correctly,
DefaultPVID is parsed correctly but not set. Will fix DefaultPVID
setting in the next SRU. This SRU thus doesn't regress any settings and
has only partial DefaultPVID key support.

** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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

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

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed

Bug description:
  [Impact]
  Newer releases of networkd support more optional settings for Bridge Priority, AgeingTimeSec and DefaultPVID.

  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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