selftests/ftrace: Skip full-glob-matching filter test on older kernel

Skip a part of ftrace filter test related to full-glob
matching if we are sure that the testing kernel is so old
that it does not support full-glob-matching yet.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>