action under with-items doesn't take non-array parameters

[Dmitri Zimine]

https://blueprints.launchpad.net/mistral/+spec/mistral-with-items-multi-inputs - I'll remove the blueprint, it's a BUG.

Filing for Winson:

Currently, if an action has multiple inputs, all the inputs need to be in the with-items array. There are cases where the action inputs can come from a previous published variables or WF inputs and they are not in an array.

Example:
with-items: name in vm_names
action: do_something n=<% name %> foo=<% my_published_var %>

[Nikolay Makhotkin (nmakhotkin)]

Please take a look at this test: https://github.com/stackforge/mistral/blob/master/mistral/tests/unit/engine1/test_with_items.py#L55-L75
here: https://github.com/stackforge/mistral/blob/master/mistral/tests/unit/engine1/test_with_items.py#L175-L201

It means that with-items should work fine with all data_context.

Moreover, I tried to test it manually:

1. Created workbook

version: "2.0"
name: wi
workflows:
  with_items:
    type: direct
    input:
     - queries
     - method
    tasks:
      task1:
        with-items: q in <% $.queries %>
        action: std.http method=<% $.method %> url="http://google.com?q=<% $.q %>!"
        publish:
          result: <% $.task1 %>

2. It works fine with input, e.g.: mistral execution-create wi.with_items '{"method": "GET", "queries": ["Alaska", "Mistral", "OpenStack"]}'

3. task task1 'SUCCESS': | task-id | task1 | wi.with_items | exec_id | SUCCESS |
4. Result contains 3 entities.