Improvements:

 * support CSR as a file
   Allow to pass template_csr as a file, as it is useful for some cases.

 * use dumps where needed, as it is available

 * fix rerequest internal call

Notes

stack/erp5

 * The service-auto-approve-amount to default is set to 1, in order that the
   only needed service is automatically approved.  As caucase is accessed
   internally (on local IPv4) only partitions on the same server will access
   caucase.