remove transaction because it is not required. The goals is reuse the transaction request_software_instance

This functionnality is already provided by request.

add workflow method to request one slave instance. The script added is a blank script; only to commit a skel of Slave Instance

remove form used to list the Slave Partitions. This form is not used anymore because Slave Partition is obsolete

Clean up the test because this tests and scripts were moved to erp5_credential. In testVifibCredential have only one test to validate if feature of subscription works in vifib context as expected.

Use by default checkUserCanChangePassword, but as in ERP5 users do not have
such persmission to Person document which defines them, check if logged in user
login is same as document reference.

Prove that user can request and revoke certificate for himself.
Prove that user cannot request twice the certificate.
Prove that user cannot request nor revoke certificate for another one.

- Added portal type Slave Instance;
- Created SlaveInstance_view without ssl_key and ssl_certificate
- Created slave_instance_slap_interface_workflow and associated it to Slave Instance

Note: Currently failing, because users cannot set own passwords.

It allows to get/revoke certificates for Person. Protected in same way as setting Person's password.

This is too dangerous, as it allows to generate certificates for any user.

Try to confirm order related to another requested software instance. It shall
fail with ValueError, which indicates in Vifib, that no free partition was
found, which means that SLA was correctly used.

As there is no way to have returned object, generate random value and reuse it
later to fetch exact object.

Also extended tests with Order Line checks.

sla_xml have to be passed always. As this test have to work on low level API
it is required to follow such API.

It supports cases when Person is in middle of requesting of Software
Instance.