ftracetest: Add kprobe basic testcases

Add basic testcases for kprobe dynamic events.
This also shows that the ftracetest accepts sub-directory
for new testcases.

Link: http://lkml.kernel.org/p/20140922234254.23415.46964.stgit@kbuild-f20.novalocalAcked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc

+#!/bin/sh
+# description: Kprobe dynamic event - adding and removing
+
+[ -f kprobe_events ] || exit 1
+
+echo 0 > events/enable || exit 1
+echo > kprobe_events || exit 1
+echo p:myevent do_fork > kprobe_events || exit 1
+grep myevent kprobe_events || exit 1
+[ -d events/kprobes/myevent ] || exit 1
+echo > kprobe_events

tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc

+#!/bin/sh
+# description: Kprobe dynamic event - busy event check
+
+[ -f kprobe_events ] || exit 1
+
+echo 0 > events/enable || exit 1
+echo > kprobe_events || exit 1
+echo p:myevent do_fork > kprobe_events || exit 1
+[ -d events/kprobes/myevent ] || exit 1
+echo 1 > events/kprobes/myevent/enable || exit 1
+echo > kprobe_events && exit 1 # this must fail
+echo 0 > events/kprobes/myevent/enable || exit 1
+echo > kprobe_events # this must succeed
+