[config] Lowercase the FQDN we get from the OS (closes #5040345)
Browsers convert the host name part of URLs to lowercase. This has the
unfortunate effect of triggering various CORS error messages in
CubicWeb (because the Origin: header will contain lowercase letters).
As per RFC 4343, host name comparison should be case-insensitive. So
let's put it in lowercase when we grab it from the host system. If
admins put uppercase letters in "host" or "base-url" in their
all-in-one.conf, then it's their fault.
<table class="attributeForm" style="width:100%;"
tal:attributes="id tab_id | nothing;
class tab_class | nothing;">
<tr tal:iter="widget lines">
<th class="labelCol" tal:content="structure python:widget.render_label(entity)">attrname</th>
<td tal:define="error python:widget.render_error(entity)" style="width:100%;"
tal:attributes="class python:error and 'error' or nothing">
<div tal:replace="structure error">error message if any</div>
<div tal:replace="structure python:widget.edit_render(entity)" >widget (input, textarea, etc.)</div>
<div tal:replace="structure python:widget.render_help(entity)">format help if any</div>
</td>
</tr>
</table>