On Theia all Slappartitions have the same user, however on bare-metal
SlapOS each partition has a different user. In this case zope nodes are
not allowed to read WCFS, because they belong to a different user (even
when every user read permission). This is a feature of FUSE and can be
disabled with 'allow_other'. This is unconditionally done with this
patch to allow deployment of WCFS on bare-metal SlapOS.