Fix gnocchi package

Due to an error in the __init__.py file name the
telemetry_tempest_plugin.gnocchi package was not an actual package.
Hence, tempest did not run the gnocchi tests.

Also fixed the location of the tests yaml file.

Change-Id: I9c1b99eb8e29950830dc21e98934e107910ba831
diff --git a/telemetry_tempest_plugin/gnocchi/__init_.py b/telemetry_tempest_plugin/gnocchi/__init__.py
similarity index 100%
rename from telemetry_tempest_plugin/gnocchi/__init_.py
rename to telemetry_tempest_plugin/gnocchi/__init__.py
diff --git a/telemetry_tempest_plugin/gnocchi/scenario/__init__.py b/telemetry_tempest_plugin/gnocchi/scenario/__init__.py
index 3ad1239..a15210a 100644
--- a/telemetry_tempest_plugin/gnocchi/scenario/__init__.py
+++ b/telemetry_tempest_plugin/gnocchi/scenario/__init__.py
@@ -25,7 +25,7 @@
 CONF = config.CONF
 
 TEST_DIR = os.path.join(os.path.dirname(__file__), '..',
-                        'gnocchi', 'functional_live', 'gabbits')
+                        'functional_live', 'gabbits')
 
 
 class GnocchiGabbiTest(tempest.test.BaseTestCase):