erp5: fix typo and remove useless line
erp5: schemas for output parameters of sub-partitions are useless
erp5: remove ipv6 hack for ZEO partition

We now use a version of ZEO that support ipv6 natively so this is useless.

Although TIDStorage only supports ipv4, it's easier and better to fix TIDStorage
rather than maintaining such hack in SlapOS.