Add example gnocchi file

- Add a sample collectd-gnocchi-plugin.conf

Change-Id: Ie7997d0c4b35964002693ea0cc83d66372b56191

etc/collectd.conf.d/collectd-gnocchi-plugin.conf

@@ -0,0 +1,34 @@
+<LoadPlugin python>
+  Globals true
+</LoadPlugin>
+
+<Plugin python>
+    ModulePath "/opt/stack/collectd-ceilometer-plugin"
+    LogTraces true
+    Interactive false
+    Import "collectd_ceilometer.gnocchi.plugin"
+
+    <Module "collectd_ceilometer.gnocchi.plugin">
+
+        # Verbosity True|False
+        VERBOSE True
+
+        # Batch size
+        BATCH_SIZE "1"
+
+        # Service endpoint addresses
+        OS_AUTH_URL "<OS_AUTH_URL>"
+
+        # Ceilometer address
+        CEILOMETER_URL_TYPE "internalURL"
+
+        # Ceilometer timeout in ms
+        CEILOMETER_TIMEOUT "1000"
+
+        # # Ceilometer user creds
+        OS_USERNAME "gnocchi"
+        OS_PASSWORD "password"
+        OS_TENANT_NAME "service"
+
+    </Module>
+</Plugin>