Adds a wrapper script to run ovs-vsctl commands in the container

Libvirt needs to be able to plug ports into openvswitch bridges.
It does this using the ovs-vsctl command, which it searches for
in $PATH[1, 2]. This change will optionally install a wrapper
script that executes the ovs-vsctl commands in the context of the
openvswitchd container. This is useful when running libvirt on the
host whilst still running openvswitch in a container. The advantage
of this method over install the packages on the host is that it
ensures client compatability with the daemon. The default is set
to false as the wrapper could overwrite ovs-vsctl installed on the
host.

[1] https://github.com/libvirt/libvirt/blob/ee51ab86c2e52b6ff1b17a4c7ad11439fd610c9e/src/util/virnetdevopenvswitch.c#L59
[2] https://github.com/libvirt/libvirt/blob/a89b17c2a75cfbaeb9e430f88e0f8a7475eb4f54/docs/kbase/internals/command.rst#id3

Closes-Bug: #1995409
Change-Id: Iaa6bfb012ae847f5f6aa0a1fc1c27970ac265f93