stack/erp5: Fix NEO URL formatting for WCFS

The NEO/go commit kirr/neo@8c974485
changed the URL with which a NEO/go client can be loaded from

    // neo://name@master1,master2,...,masterN?options

to

    neo(s)://[credentials@]master1,master2,...,masterN/name?options

We need to apply this change in the NEO URL structure to instance-wcfs.cfg.in
to use WCFS with NEO storage.

Why?
====

The URL in instance-wcfs.cfg.in is finally send to wcfs binary, which
will open a NEO/go client with this URL via the "openClientByURL" function [1].
If the URL formatting instance-wcfs.cfg.in follows the old pattern,
NEO/go is unable to create a NEO/go client and may even raise an
exception [2], because information regarding NEO server is at the wrong
position of the URL.

---

[1] See https://lab.nexedi.com/kirr/neo/blob/87199da2b163c09ed3946b7ab9bb00a5b987d377/go/neo/client.go#L416-534
for openClientByURL.

[2] For instance when using the old pattern of putting the cluster name
in the "user" part, NEO/go will raise "credentials can be specified only
with neos:// scheme", because NEO/go reserves the "user" part for
encryption information,
see https://lab.nexedi.com/kirr/neo/blob/87199da2b163c09ed3946b7ab9bb00a5b987d377/go/neo/client.go#L449

---

/reviewed-by @kirr
/reviewed-on !1307

stack/erp5/buildout.hash.cfg

@@ -70,7 +70,7 @@ md5sum = b95084ae9eed95a68eada45e28ef0c04
 
 [template]
 filename = instance.cfg.in
-md5sum = a75e8cf8fd664de164a88a680ddd2c9e
+md5sum = 74979d6743cdc7ce3d2f17680115458d
 
 [template-erp5]
 filename = instance-erp5.cfg.in
@@ -102,4 +102,4 @@ md5sum = 5cf0316fdd17a940031e4083bbededd8
 
 [instance-wcfs.cfg.in]
 filename = instance-wcfs.cfg.in
-md5sum = eb4be2669a9a56187cc4366272e11d18
+md5sum = 0f921643a68e3a8de5529d653710ddca

stack/erp5/instance-wcfs.cfg.in

 {# instance that runs WCFS service associated with ZODB storage  #}
 {% from "instance_zodb_base" import zodb_dict  with context %}
 
+{# q(text) returns urllib.quote_plus(text) #}
+{% macro q(text) %}{{ urllib_parse.quote_plus(text) }}{% endmacro %}
 
 {# build zurl to connect to configured ZODB #}
 {% if len(zodb_dict) != 1 -%}
@@ -12,15 +14,18 @@
 {% if zodb['type'] == 'zeo' -%}
 {%   set zurl = ('zeo://%s?storage=%s' % (z['server'], z['storage'])) -%}
 {% elif zodb['type'] == 'neo' -%}
-{%   set zurl = ('neo://%s@%s' % (z.pop('name'), z.pop('master_nodes'))) -%}
-{%   set argv = [] -%}
-{%   set i = 0 -%}
-{%   for k,v in z|dictsort -%}
-{%     do argv.append('%s=%s' % (k,v)) -%}
-{%   endfor -%}
-{%   if len(argv) > 0 -%}
-{%     set zurl = zurl + '&' + '?'.join(argv) -%}
+{#   neo(s)://[credentials@]master1,master2,...,masterN/name?options #}
+{#   (see https://lab.nexedi.com/kirr/neo/blob/3e13fa06/go/neo/client.go#L417) #}
+{#   If 'ca' in storage-dict, ssl is true. #}
+{#   (see https://lab.nexedi.com/nexedi/slapos/blob/397726e1/stack/erp5/instance-zodb-base.cfg.in#L17-21) #}
+{%   if "ca" in z -%}
+{#     ca=ca.crt;cert=my.crt;key=my.key  (see https://lab.nexedi.com/kirr/neo/blob/3e13fa06/go/neo/client.go#L428) #}
+{%     set zurl = 'neos://ca=%s;cert=%s;key=%s@' % (q(z.pop("ca")), q(z.pop("cert")), q(z.pop("key"))) -%}
+{%   else -%}
+{%     set zurl = 'neo://' -%}
 {%   endif -%}
+{%   set zurl = ('%s%s/%s' % (zurl, z.pop('master_nodes'), z.pop('name'))) -%}
+{%   set zurl = zurl + '?' + (z | dictsort | urlencode) -%}
 {% else -%}
 {%   do assert(False, ("unsupported ZODB type", zodb)) -%}
 {% endif -%}

stack/erp5/instance.cfg.in

@@ -206,6 +206,7 @@ url = {{ instance_wcfs_cfg_in }}
 filename = instance_wcfs.cfg
 extra-context =
     section parameter_dict dynamic-template-zope-parameters
+    import urllib_parse six.moves.urllib.parse
 import-list =
     file instance_zodb_base context:template-zodb-base