tools lib traceevent: Factor out and export print_event_field[s]()

The print_event_field() and print_event_fields() functions print basic
information of a given field or event without the print format.  They'll
be used by dynamic sort keys later.

Committer note:

Rename it to pevent_print_field[s]() to get proper namespacing, as
discussed with Steven Rostedt.

Signed-off-by: Namhyung Kim <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Acked-by: Steven Rostedt <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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