Check for duplicated DN on user creation
Implement _preModifyUser on LdapUserBase
Change user modification hook from _modifyUser to _preModifyUser

Throw DataExists exception if the user try to rename a user on a
container and already exists
set proper dependency
untabify file
ident file
Merge branch '3.2' into scabrero/samba-improve-user-creation-errors

Conflicts:
	main/samba/ChangeLog
	main/users/ChangeLog
Removed code made dead by new managament of DHCP nameservers
Fixed some issues with showing of DHCP nameservers and removed related dead code
Added nameservesUpdated callback. Use own Zentyal DNS server if it is is enabled
clear debug
added nameserversUpdated callback
Merge branch '3.2' into scabrero/samba-improve-user-creation-errors

Conflicts:
	main/samba/ChangeLog
Merge pull request #892 from Zentyal/scabrero/samba-improve-user-creation-errors

Scabrero/samba improve user creation errors
Remove lock file in EBox::Util::Lock::unlock()
Merge pull request #919 from Zentyal/rduran/multigw-fix

Remove lock file in EBox::Util::Lock::unlock()
netowrk module itself return 127.0.0.1 as name server when dns enabled
dont create rules for localhost dns resolver
removed nameserversUpdated trigger
fixed dhclient conf