[PATCH] lib/tevent: Add trace point callback

[Martin Schwenke]

lib/tevent: Add trace point callback

Set/get a single callback function to be invoked at various trace
points.  Define "before wait" and "after wait" trace points - more
trace points can be added later if required.

CTDB wants this to log long waits and events.

================================

* There's a prerequisite patch that adds a tevent_context* to
  poll_event_context.  This makes all backends consistent.

* I've been back and forth with Volker a few times to get the patch
  into its current state.

Patches also in my git repo at:

  http://git.ozlabs.org/?p=martins-samba.git;a=shortlog;h=refs/heads/tevent-wip

peace & happiness,
martin
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