[8.0][Tempest] Heat cannot create stack from template: Found a [<type 'unicode'>] instead

[Vladimir Jigulin]

Catched on tempest test: test_exceed_max_template_size_fails
Steps to reproduce:
1. Deploy cluster with heat
2. Create template file heat.tmpl with content:
HeatTemplateFormatVersion: '2012-12-12'
Description: 'Description'
Outputs:
  Foo: bar
3. Try to create new stack: heat stack-create -f stack.tmpl test1
heatclient.exc.HTTPBadRequest: ERROR: Output validation error: : Outputs: : Outputs must contain Output. Found a [<type 'unicode'>] instead

Traceback:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/heat/common/context.py", line 308, in wrapped
    return func(self, ctx, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/heat/engine/service.py", line 747, in create_stack
    parent_resource_name)
  File "/usr/lib/python2.7/dist-packages/heat/engine/service.py", line 658, in _parse_template_and_validate_stack
    stack.validate()
  File "/usr/lib/python2.7/dist-packages/osprofiler/profiler.py", line 105, in wrapper
    return f(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/heat/engine/stack.py", line 709, in validate
    message=message)
StackValidationFailed: Output validation error: Outputs: Outputs must contain Output. Found a [<type 'unicode'>] instead

Reproducibility: 100%
First fail: 07/14/17
Last pass: 04/26/17

[Vladimir Jigulin (vjigulin)]

The cause of the failures was the incorrect configuration of tempest. Close as invalid until there is no updates.