selftests/bpf: Parametrize AF_UNIX redir functions to accept send() flags

Extend pairs_redir_to_connected() and unix_inet_redir_to_connected() with a
send_flags parameter. Replace write() with send() allowing packets to be
sent as MSG_OOB.

Signed-off-by: Michal Luczaj <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Tested-by: Jakub Sitnicki <[email protected]>
Reviewed-by: Jakub Sitnicki <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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