If a promise timeout or return no message, return promise result with
error if the problem is happening for a second time or if there was
already an error. The goal is to reduce temporary failure.

On a setup for private cloud (internal master), reguralisation requests are not relevant and risky as alarms may trigger removal of instances due unpaid invoices.

This was done by Sven Franck.

Old software releases may have one old frontend url which leads to no software, this change allows others masters keep their own frontend configuration with existing software releases.

if the message size is too big, the promise process can hang on queue.put and parent process will no be able to read the message.
This will finally result in a deadlock situation.

Since 65f73750 the URLs are cached, so
test was failing because they were not isolated.

/reviewed-on nexedi/slapos.core!45

By updating allocation_scope the capacity_scope can be automatically updated.

Still WIP

This is for adjust subject_list and capacity_scope of the computer after the computer been edited.

In this case, we will allow the super users pay eventually the invoices.

Include tests for Request/Revoke certificates
Destroy Software Installation

This includes tests for:
- access person information
- update person information
- get token for the user
- request certificate
- revoke certificate