move from with_<lookup>: to loop:

- old functionality is still available direct lookup use, the following are equivalent

  with_nested: [[1,2,3], ['a','b','c']]

  loop: "{{lookup('nested', [1,2,3], ['a','b','c'])}}"

- avoid squashing with 'loop:'
- fixed test to use new intenal attributes
- removed most of 'lookup docs' as these now reside in the plugins

docs/docsite/rst/guide_packet.rst

@@ -178,7 +178,7 @@ The following playbook will create an SSH key, 3 Packet servers, and then wait u
           port: 22
           state: started
           timeout: 500
-        with_items: "{{ newhosts.devices }}"
+        loop: "{{ newhosts.devices }}"
 
 
 As with most Ansible modules, the default states of the Packet modules are idempotent, meaning the resources in your project will remain the same after re-runs of a playbook. Thus, we can keep the ``packet_sshkey`` module call in our playbook. If the public key is already in your Packet account, the call will have no effect.