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If the following configuration section is present:

<product-config initsite>
  owner <user-id>
  id <site-id>
  <key> <value>
</product-config>

the ERP5 product automatically creates a site at startup if there's none.
This is done by "extending" AppInitializer (OFS.Application).

<key> is any string parameter accepted by manage_addERP5Site, including new
ones to configure Cloudooo and install bt5. Cloudooo is often required by the
configurator: apart from that, it does not deserve a field on the addERP5Site
form.

This deprecates erp5_promise, at least in its current form, for several reasons:

- Since 7fe14b20, alarms aren't run often
  enough.

- For the configuration of external services like memcached, using an alarm or
  anything not instantaneous to update them is wrong because it poses a risk to
  connect to wrong instances. erp5_promise does not handle the catalog because
  it could not and we have another mechanism for that (userhosts...