Merge branch 'net-selftests-unique-namespace-last-part'

Merge branch 'net-selftests-unique-namespace-last-part'

Hangbin Liu says:

====================
Convert net selftests to run in unique namespace (last part)

Here is the last part of converting net selftests to run in unique namespace.
This part converts all left tests. After the conversion, we can run the net
sleftests in parallel. e.g.

 # ./run_kselftest.sh -n -t net:reuseport_bpf
 TAP version 13
 1..1
 # selftests: net: reuseport_bpf
 ok 1 selftests: net: reuseport_bpf
  mod 10...
 # Socket 0: 0
 # Socket 1: 1
 ...
 # Socket 4: 19
 # Testing filter add without bind...
 # SUCCESS

 # ./run_kselftest.sh -p -n -t net:cmsg_so_mark.sh -t net:cmsg_time.sh -t net:cmsg_ipv6.sh
 TAP version 13
 1..3
 # selftests: net: cmsg_so_mark.sh
 ok 1 selftests: net: cmsg_so_mark.sh
 # selftests: net: cmsg_time.sh
 ok 2 selftests: net: cmsg_time.sh
 # selftests: net: cmsg_ipv6.sh
 ok 3 selftests: net: cmsg_ipv6.sh

 # ./run_kselftest.sh -p -n -c net
 TAP version 13
 1..95
 # selftests: net: reuseport_bpf_numa
 ok 3 selftests: net: reuseport_bpf_numa
 # selftests: net: reuseport_bpf_cpu
 ok 2 selftests: net: reuseport_bpf_cpu
 # selftests: net: sk_bind_sendto_listen
 ok 9 selftests: net: sk_bind_sendto_listen
 # selftests: net: reuseaddr_conflict
 ok 5 selftests: net: reuseaddr_conflict
 ...

Here is the part 1 link:
https://lore.kernel.org/netdev/20231202020110.362433-1-liuhangbin@gmail.com
part 2 link:
https://lore.kernel.org/netdev/20231206070801.1691247-1-liuhangbin@gmail.com
part 3 link:
https://lore.kernel.org/netdev/20231213060856.4030084-1-liuhangbin@gmail.com
====================

Signed-off-by: David S. Miller <davem@davemloft.net>