2.2 core: Added missing pre-save and post-save directories

I have serious trouble with zentyal-package so I cannot build the deb to test it.

However this should be fix, but it need the build package check to be sure that the /etc/zentyal/pre-save and /etc/zentyal/post-save are created or keep.


See http://forum.zentyal.org/index.php?topic=14818.new for more information