Merge branch 'bpf-misc-test-fixes'

Stanislav Fomichev says:

====================
* add test__skip to indicate skipped tests
* remove global success/error counts (use environment)
* remove asserts from the tests
* remove unused ret from send_signal test

v3:
* QCHECK -> CHECK_FAIL (Daniel Borkmann)

v2:
* drop patch that changes output to keep consistent with test_verifier
  (Alexei Starovoitov)
* QCHECK instead of test__fail (Andrii Nakryiko)
* test__skip count number of subtests (Andrii Nakryiko)
====================

Cc: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>