wcfs/fuse: Allow other users to access file system

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.

wcfs/wcfs.go

@@ -2838,6 +2838,9 @@ func _main() (err error) {
 
 		DisableXAttrs: true,        // we don't use
 		Debug:         *debug,
+
+		// Give access to zope users (that reside on a different Slappartition than WCFS)
+		AllowOther: true,
 	}
 
 	fssrv, fsconn, err := mount(mntpt, root, opts)