Added a special case to map 'Domain Admins' DN from OpenLDAP to LDB.
Merge pull request #474 from Zentyal/cperello/domain-admins-mapping-workaround

Added a special case to map 'Domain Admins' DN from OpenLDAP to LDB.
Fix regression in dhcp-gateway.pl which interfered with save  change process
Merge pull request #475 from Zentyal/jag/network-dhcp-gateway-regression

Fix regression in dhcp-gateway.pl which interfered with save  change pro...
Merge branch 'master' into cperello/s4sync-fixes

Conflicts:
	main/samba/ChangeLog
preAdd callbacks get a second argument noting the parent when this new object will be created.
Added objectByObjectGUID to retrieve an LDB object from its LDAP replica. Made intense use of the mapping LDAP <-> LDB using the objectGUID instead of the DN calculation