stack/erp5: Fix master node separation in NEO URI

In nexedi/slapos@0cf70a6e we already migrated the NEO URI concatenation to the
recent format used by WCFS. Unfortunately we missed separating the address
(IPv6 + port) of the master nodes from each other. Without adding the
separator ',' between them, WCFS doesn't work with NEO clusters which have
multiple master nodes, because NEO/go can't split the different master node
addresses.

stack/erp5/buildout.hash.cfg

@@ -102,4 +102,4 @@ md5sum = 5cf0316fdd17a940031e4083bbededd8
 
 [instance-wcfs.cfg.in]
 filename = instance-wcfs.cfg.in
-md5sum = 0f921643a68e3a8de5529d653710ddca
+md5sum = a495f84194a46c585b89947f8bc7d754

stack/erp5/instance-wcfs.cfg.in

@@ -24,7 +24,7 @@
 {%   else -%}
 {%     set zurl = 'neo://' -%}
 {%   endif -%}
-{%   set zurl = ('%s%s/%s' % (zurl, z.pop('master_nodes'), z.pop('name'))) -%}
+{%   set zurl = ('%s%s/%s' % (zurl, z.pop('master_nodes')|replace(" ", ","), z.pop('name'))) -%}
 {%   set zurl = zurl + '?' + (z | dictsort | urlencode) -%}
 {% else -%}
 {%   do assert(False, ("unsupported ZODB type", zodb)) -%}