tevent: Remove the signal pipe if no signal events are around

It makes adding/removing the first/last sigevents a bit more expensive, but it
will fix tevent_loop_wait not finishing when one signal event was added and
removed.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=10012

Signed-off-by: Volker Lendecke <vl@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
tevent: change version to 0.9.19

* Fix tevent testsuite issue on Solaris.
* Add tevent tuturial and documentation updates
* Fix Coverity ID 989236 Operands don't affect result
* Bug: https://bugzilla.samba.org/show_bug.cgi?id=10012

Signed-off-by: Stefan Metzmacher <metze@samba.org>

Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Thu Aug  1 17:05:02 CEST 2013 on sn-devel-104
security.idl: add new security_secinfo bits

[MS-DTYP].pdf 2.4.7

Signed-off-by: Gregor Beck <gbeck@sernet.de>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Fix bug 9678 - Windows 8 Roaming profiles fail

Windows 8 tries to set 'ATTRIBUTE_SECURITY_INFORMATION' on some
dirs. Ignoring it makes roaming profiles work again.
Just like w2k3 gracefully ignore all the other bits.

Signed-off-by: Gregor Beck <gbeck@sernet.de>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Thu Aug  1 20:58:25 CEST 2013 on sn-devel-104