Merge branch 'net-selftests-unique-namespace'

Hangbin Liu says:

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Convert net selftests to run in unique namespace (Part 2)

Here is the 2nd part of converting net selftests to run in unique namespace.
This part converts all bridge, vxlan, vrf tests.

Here is the part 1 link:
https://lore.kernel.org/netdev/20231202020110.362433-1-liuhangbin@gmail.com
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Signed-off-by: David S. Miller <davem@davemloft.net>