tools lib traceevent: Add interface for options to plugins

Add tep_plugin_add_option() and tep_plugin_print_options() to lib
traceevent library that allows plugins to have their own options. For
example, the function plugin by default does not print the parent, as it
uses the parent to do the indenting. The "parent" option is created by
the function plugin that will print the parent of the function like it
does in the trace file.

The tep_plugin_print_options() will print out the list of options that a
Cc: Tzvetomir Stoyanov (VMware) <[email protected]>
plugin has defined.

Link: http://lore.kernel.org/linux-trace-devel/[email protected]
Link: http://lore.kernel.org/linux-trace-devel/[email protected]

Signed-off-by: Tzvetomir Stoyanov (VMware) <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: [email protected]
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Steven Rostedt (VMware) <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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