ldb: Extended LDB requests under transaction

[Matthias Dieter Wallnöfer]

Hi LDB developers,

currently LDB does not require transactions when an extended operation 
is launched. A long term goal from my side is to provide the extended 
password change mechanism: 
https://bugzilla.samba.org/show_bug.cgi?id=5611. Hence I'm worrying if 
we need to apply transactions also on this type of request - my patch 
proposal: 
http://gitweb.samba.org/samba.git/?p=mdw/samba.git;a=commitdiff;h=45bd4197168b4a6642e33386d21d9168ebf8f7f9. 
What do you think?

Thanks,
Matthias