This reverts commit 40108537.

Using the public cloudooo for all unit tests makes things
unreliable, we have every day many tests failing due to this. It
would be required to reapply this change to :
- make ERP5 more resilient to network failures when there is
  issues connecting to cloudooo
- find some automated ways to have a cloudooo per testnode machine,
  with idea of having possibility to request "where is the
  nearest service doing that"
- possibly having a CDN of cloudooo, but this does not prevent having
  a cloudooo per testnode