selftests/bpf: Propagate errors during setup for reuseport tests

Prepare for switching reuseport tests to test_progs framework, where we
don't have the luxury to terminate the process on failure.

Modify setup helpers to signal failure via the return value with the help
of a macro similar to the one currently in use by the tests.

Signed-off-by: Jakub Sitnicki <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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