Change default value of DELEGATE_AUTHORIZED_ROLES

[haruki-yamanashi]

Change default value of DELEGATE_AUTHORIZED_ROLES from admin to
monitoring-delegate because of following two reasons.

• There is inconsistency between monasca-docker default value and
  OpenStack monasca api project document.
• It's not secure to allow admin authorization to other users.

[haruki-yamanashi]

@craigbr @matrixik @knakazono @witekest @digitalfishpond

[knakazono]

https://github.com/openstack/monasca-agent/blob/master/docs/MonascaMetrics.md#cross-tenant-metric-submission
Here is the document which says "monitoring-delegate".

[matrixik]

Don't you also need to change it in Keystone?

[witekest]

@matrixik But only in OpenStack's Keystone. The only scenario when delegate roles are used, is libvirt monitoring.

[matrixik]

Every time same tempest test fail:

test_list_metrics_with_project

==============================
Failed 1 tests - output below:
==============================

monasca_tempest_tests.tests.api.test_metrics.TestMetrics.test_list_metrics_with_project[gate]
---------------------------------------------------------------------------------------------

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "monasca_tempest_tests/tests/api/test_metrics.py", line 505, in test_list_metrics_with_project
        if str(element['name']) == name:
    UnicodeEncodeError: 'ascii' codec can't encode characters in position 8-11: ordinal not in range(128)
    

Captured pythonlogging:
~~~~~~~~~~~~~~~~~~~~~~~
    2017-12-05 13:51:22,461 13 INFO     [tempest.lib.common.rest_client] Request (TestMetrics:test_list_metrics_with_project): 201 POST http://keystone:35357/v3/projects 0.049s
    2017-12-05 13:51:22,477 13 INFO     [tempest.lib.common.rest_client] Request (TestMetrics:test_list_metrics_with_project): 204 POST http://monasca:8070/v2.0/metrics?tenant_id=df4a550a8a684b0095c598dfa531f565 0.014s
    2017-12-05 13:51:22,498 13 INFO     [tempest.lib.common.rest_client] Request (TestMetrics:test_list_metrics_with_project): 200 GET http://monasca:8070/v2.0/metrics?tenant_id=df4a550a8a684b0095c598dfa531f565 0.015s
    2017-12-05 13:51:22,599 13 INFO     [tempest.lib.common.rest_client] Request (TestMetrics:_run_cleanups): 204 DELETE http://keystone:35357/v3/projects/df4a550a8a684b0095c598dfa531f565 0.096s