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selftests/bpf: convert test_cgrp2_attach2 example into kselftest
Convert test_cgrp2_attach2 example into a proper test_cgroup_attach
kselftest. It's better because we do run kselftest on a constant
basis, so there are better chances to spot a potential regression.
Also make it slightly less verbose to conform kselftests output style.
Output example:
$ ./test_cgroup_attach
#override:PASS
#multi:PASS
test_cgroup_attach:PASS
Signed-off-by: Roman Gushchin <guro@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>