cinder builtin tests config location

Many cinder built-in testcases failed because they
can not find cinder configuration file, as these
testcases assume that they are run at python
site-packages dir.  So forcing these failure
testcases to look for these confiugration file
using absolute path.

Signed-off-by: Vu Tran <vu.tran@windriver.com>

Index: git/cinder/tests/conf_fixture.py
===================================================================
--- git.orig/cinder/tests/conf_fixture.py
+++ git/cinder/tests/conf_fixture.py
@@ -43,7 +43,7 @@ def set_defaults(conf):
     conf.set_default('iscsi_num_targets', 8)
     conf.set_default('connection', 'sqlite://', group='database')
     conf.set_default('sqlite_synchronous', False)
-    conf.set_default('policy_file', 'cinder/tests/policy.json')
+    conf.set_default('policy_file', '%PYTHON_SITEPACKAGES_DIR%/cinder/tests/policy.json')
     conf.set_default(
         'xiv_ds8k_proxy',
         'cinder.tests.test_ibm_xiv_ds8k.XIVDS8KFakeProxyDriver')