call Exception.__init__ correctly in MultipleNodeError
call Exception.__init__ correctly in MultipleNodeError

The pylint cleanup in the previous commit was bad in that it didn't pass
'self' to Exception.__init__.  Result would be to call that method as a
static method (which probably isn't going to work).  This fixes that.

Signed-off-by: Scott Moser <f411aed5b71f5ab75e7f202cdde1f0f4410975aa@linux.vnet.ibm.com>

Awingu/open-ovf,Awingu/open-ovf,Awingu/open-ovf,Awingu/open-ovf