bpf: Add test_tag to .gitignore

Signed-off-by: Mickaël Salaün <mic@digikod.net>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/bpf/.gitignore

@@ -2,3 +2,4 @@ test_verifier
 test_maps
 test_lru_map
 test_lpm_map
+test_tag