post_test_hook: stop sourcing gnocchi/devstack/settings

It's gone.

Change-Id: Ibc4186d355a53446ff2f2dbaa4e12f1d09bd18c9
diff --git a/ceilometer/tests/integration/hooks/post_test_hook.sh b/ceilometer/tests/integration/hooks/post_test_hook.sh
index 44ff544..eb5139a 100755
--- a/ceilometer/tests/integration/hooks/post_test_hook.sh
+++ b/ceilometer/tests/integration/hooks/post_test_hook.sh
@@ -61,8 +61,6 @@
 
     gnocchi status
 
-    # Be sure to source Gnocchi settings before
-    source $BASE/new/gnocchi/devstack/settings
     echo "* Unprocessed measures:"
     for key in $(redis-cli --scan --pattern 'incoming*'); do echo -n $key && redis-cli llen $key; done