Fix ResourceOrigin for host creation process

[bastian-src]

There are the following issues with the host creation process and determining the host resources at that moment:

• a hash map is used with the host ID as key. But, during the host creation, the new host as no id
  • → (switching to name as hash map key)
• could not determine host resources during host creation, as the resources are stored in the host.compute_attributes attribute
  • → (needs a new ResourceOrigin: ComputeAttributesOrigin)
• no detailed error output is given when the host creation fails due to a resource quota limitation/error
  • → add explicit error outputs and custom Exception classes

Full changelog:

• Add new resource origin ComputeAttributesOrigin (available during host creation)
• In ResourceOrigins, iterate hosts by name instead of id (new host has no id)
• Add resource quota exception classes
• Add host managed extensions test
• Add host managed factory extensions
• Fix resource to string and tests
• Fix deepCopy null error
• Fix autoload filepaths