bpf: sockmap, add tests for proto updates single socket to many map

Add test with multiple maps where each socket is inserted in multiple
maps. Test protocols: TCP, UDP, stream af_unix and dgram af_unix.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/r/20231221232327.43678-5-john.fastabend@gmail.com