[PoC] Add loop_control.lookup

[sivel]

SUMMARY

Add loop_control.lookup to provide a transition from with_ to loop without explicit lookup call

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

lib/ansible/playbook/loop_control.py

ADDITIONAL INFORMATION

Example:

Using with_fileglob:

- debug:
    var: item
  with_fileglob:
    - /path/one/*
    - /path/two/*

Using loop + lookup:

- debug:
    var: item
  loop: '{{ q("fileglob", "/path/one/*", "/path/two/*") }}'

Using loop_control.lookup:

- debug:
    var: item
  loop:
    - /path/one/*
    - /path/two/*
  loop_control:
    lookup: fileglob

[sivel]

This explicit templar call may be unnecessary now