Fact proccessing fixes (#22003)
Fact proccessing fixes (#22003)

* clarify facts assignment for several corner cases

run_once/delegate_facts:
 now delegate_facts > run_once, previously run_once always published facts to all hosts in play

include_vars/delegate_to:
  now include_vars allows to delegate to a specific host

also fix task_vars exception in delegate_facts/loop as var was removed

fixes #15365

* removed unused loop_var

thaim/ansible,thaim/ansible