Merge openvswitch from Debian unstable for l-series

[Frode Nordahl]

The Ubuntu OVN team has been working together with the Ubuntu Server team on refreshing the upstream Open vSwitch packaging.

As a consequence of this work the upstream repository [0] and the Debian repository [1] now contains a package source comparable to what we have in Ubuntu, and as such we want to set up a sync of the Debian package moving forward.

The remaining difference now is:
* updates to prepare for the new Open vSwitch 3.1 release
* Debian requirements, such as README.Debian, SYSV init files, support for building with multiple Python versions and test skip lists

The Ubuntu Server team has started the process for the required dependencies which can be tracked in bug 1993398.

0: https://github.com/openvswitch/ovs
1: https://salsa.debian.org/openstack-team/third-party/openvswitch

[Frode Nordahl (fnordahl)]

Package building at https://launchpad.net/ubuntu/+source/openvswitch/3.1.0~git20221212.739bcf2-4

[Frode Nordahl (fnordahl)]

The synced package has a dependency subject to a MIR process ref bug 2002103