tools lib traceevent: Show value of flags that have not been parsed

If the value contains bits that are not defined by print_flags() helper,
then show the remaining bits. This aligns with the functionality of the
kernel.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/e60c889f-55e7-4ee8-0e50-151e435ffd8c@siemens.com
Link: http://lkml.kernel.org/r/20180112004821.976225232@goodmis.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>