ftrace: add pretty print function for traceon and traceoff hooks
This patch adds a pretty print version of traceon and traceoff
output for set_ftrace_filter.
# echo 'sys_open:traceon:4' > set_ftrace_filter
# cat set_ftrace_filter
#### all functions enabled ####
sys_open:traceon:count=4
Signed-off-by: NSteven Rostedt <srostedt@redhat.com>
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