Default variables for edp.yaml and credentials.yaml not applied

[Evgeny Sikachev]

ENVIRONMENT: master (18 march 2016)
In the README file (https://github.com/openstack/sahara-tests/blob/master/sahara_tests/scenario/README.rst) specified default values for fields in credentials.yaml, but if you do not specify this values before running - tests failed with next trace:
Traceback (most recent call last):
  File ".tox/venv/bin/sahara-scenario", line 10, in <module>
    sys.exit(main())
  File "/Users/esikachev/sahara-tests/sahara_tests/scenario/runner.py", line 239, in main
    template_variables, verbose_run)
  File "/Users/esikachev/sahara-tests/sahara_tests/scenario/runner.py", line 148, in read_scenario_config
    template = scenario_template.render_unicode(**template_vars)
  File "/Users/esikachev/sahara-tests/.tox/venv/lib/python2.7/site-packages/mako/template.py", line 454, in render_unicode
    as_unicode=True)
  File "/Users/esikachev/sahara-tests/.tox/venv/lib/python2.7/site-packages/mako/runtime.py", line 829, in _render
    **_kwargs_for_callable(callable_, data))
  File "/Users/esikachev/sahara-tests/.tox/venv/lib/python2.7/site-packages/mako/runtime.py", line 864, in _render_context
    _exec_template(inherit, lclcontext, args=args, kwargs=kwargs)
  File "/Users/esikachev/sahara-tests/.tox/venv/lib/python2.7/site-packages/mako/runtime.py", line 890, in _exec_template
    callable_(context, *args, **kwargs)
  File "etc_scenario_defaults_credentials_yaml_mako", line 38, in render_body
NameError: 'OS_USERNAME' is not defined

Need to add ability to run tests with default values, add ability change this values in .ini file or args

[Evgeny Sikachev (esikachev)]

https://review.openstack.org/#/c/297757/5

[OpenStack Infra (hudson-openstack)]

Change abandoned by Evgeny Sikachev (<email address hidden>) on branch: master
Review: https://review.openstack.org/297757
Reason: https://review.openstack.org/#/c/342877/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/342877
Committed: https://git.openstack.org/cgit/openstack/sahara-tests/commit/?id=2daa3f1728627eebae1b778f33dee31dd8723614
Submitter: Jenkins
Branch: master

commit 2daa3f1728627eebae1b778f33dee31dd8723614
Author: Raissa Sarmento <email address hidden>
Date: Fri Jul 15 10:57:10 2016 -0300

    Added ability to use auth env variables or flags

    It's now possible to either export auth related environment variables or
    to specify via flags. OS_* variables were removed from yaml and ini files.

    Change-Id: I3ed9e2d73c886481073f1a00777ca0f2d498bebb
    Closes-Bug: #1558994

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/sahara-tests 0.3.0 release.