selftests: Remove KSFT_TAP_LEVEL
Since sub-testing can now be detected by indentation level, this removes
KSFT_TAP_LEVEL so that subtests report their TAP header for later parsing.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
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