Raise more specific error when an Objectclass Violation occurs Fix the virtual plugin to work with the new backend

ipaserver/plugins/ldap2.py

@@ -99,6 +99,8 @@ def _handle_errors(e, **kw):
         # it indicates the previous attribute was removed by another
         # update, making the oldentry stale.
         raise errors.MidairCollision()
+    except _ldap.OBJECT_CLASS_VIOLATION:
+        raise errors.ObjectclassViolation(info=info)
     except _ldap.ADMINLIMIT_EXCEEDED, e:
         raise errors.LimitsExceeded()
     except _ldap.SIZELIMIT_EXCEEDED, e: