tevent: version 0.9.27

tevent: version 0.9.27

* Fix bug in poll backend - poll_event_loop_poll()
  exits the for loop on POLLNVAL instead of
  continuing to find an event that is ready.
* Fix ETIME handling for Solaris event ports (bug #11728).

Bug: https://bugzilla.samba.org/show_bug.cgi?id=11771

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
Autobuild-User(master): Michael Adam <obnox@samba.org>
Autobuild-Date(master): Tue Feb 16 00:00:51 CET 2016 on sn-devel-144

(cherry picked from commit 2267faddfa9863b205dfad580fbd45182916cb32)