Merge branch 'bpf-misc-selftest-improvements'

Joe Stringer says:

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This is series makes some minor changes primarily focused on making it easier
to understand why test_verifier is failing a test. This includes printing the
observed output when a test fails in a different way than expected, or when
unprivileged tests fail due to sysctl kernel.unprivileged_bpf_disabled=1. The
last patch removes some apparently dead code.
====================

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>