test_notifications.TestMeterProcessing.test_fallback_meter_path fails if meter.yaml files exists under /etc directory

[Lianhao Lu]

If meter.yaml files exists under /etc/ceilometer directory, the test_notifications.TestMeterProcessing.test_fallback_meter_path test case will fail:
======================================================================
FAIL: test_notifications.TestMeterProcessing.test_fallback_meter_path
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test_notifications.py", line 162, in test_fallback_meter_path
    self.assertIn("meter/data/meters.yaml", fall_bak_path)
  File "/opt/stack/ceilometer/.tox/py27/local/lib/python2.7/site-packages/testtools/testcase.py", line 356, in assertIn
    self.assertThat(haystack, Contains(needle), message)
  File "/opt/stack/ceilometer/.tox/py27/local/lib/python2.7/site-packages/testtools/testcase.py", line 435, in assertThat
    raise mismatch_error
testtools.matchers._impl.MismatchError: 'meter/data/meters.yaml' not in '/etc/ceilometer/meters.yaml'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/215001

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/215001
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=329b986f13d9c9127e9b8b46eb26d66f6807eb12
Submitter: Jenkins
Branch: master

commit 329b986f13d9c9127e9b8b46eb26d66f6807eb12
Author: Lianhao Lu <email address hidden>
Date: Thu Aug 20 15:32:31 2015 +0800

    Corrected test_fallback_meter_path test case

    Make sure the test_fallback_meter_path test case won't fail if
    /etc/ceilometer/meters.yaml file exists or not.

    Closes-Bug: #1486869
    Change-Id: I630aa6a2fca48d87fcd7f9584701e461222a9bed