Ignore case in storage families.

This value is used as a directory name, so we should follow the common
denominator.

stack/erp5/buildout.cfg

@@ -289,7 +289,7 @@ md5sum = c745d794b28cae64feba527f894d7340
 [template-zeo]
 < = download-base
 filename = instance-zeo.cfg.in
-md5sum = 0462785ed2663c8e1eebd9cf1f7fd1cf
+md5sum = 9fff70e6958bccbb3d4982cb3611813f
 
 [template-cluster-zope]
 < = download-base

stack/erp5/instance-zeo.cfg.in

@@ -46,7 +46,7 @@ ipv6 = {{ ipv6 }}
 
 {% for export_id, mountpoint_dict in slapparameter_dict['zodb-dict'].items() -%}
 {%   do storage_dict.setdefault(
-       mountpoint_dict.get('storage-family', 'default'), []
+       mountpoint_dict.get('storage-family', 'default').lower(), []
      ).append((
        export_id,
        mountpoint_dict.get('mount-point', '/'),