v8.0.31

[rel-v8r0]

*Resources

NEW: (#7248) Add support for loading external providers in CloudCE
NEW: (#7248) Add OpenNebula6 (XMLRPC) provider for CloudCE/libcloud

*Subsystem

FIX: (#7247) prevent AREXCE from creationg delegations each time a CE got a small and temporary issue

*TransformationSystem

FIX: (#7242) TransformationCleaningAgent: fix two exceptions for CleanWithRMS: encoding before hashing, accessing res["Value"]["Failed"] when Value is None
NEW: (#7223) TransformationCleaningAgent: add CleanWithRMS option to clean files via the RequestManagementSystem asynchronously rather than serially in the agent run itself

*FrameworkSystem

CHANGE: (#7236) ComponentSupervisionAgent: use gConfig to get the setup from /DIRAC/Setup
CHANGE: (#7236) ComponentSupervisionAgent remove Setup option

*WorkloadManagement

CHANGE: (#7208) pilot submission with tokens in a multi-VO context

*docs

NEW: (#7176) add documentation about setting up DIRAC to submit pilots with tokens