gate: add missing sudo

Change-Id: I69011f469e8c28cf18ee527fbacfd057d955518f
diff --git a/ceilometer/tests/integration/hooks/post_test_hook.sh b/ceilometer/tests/integration/hooks/post_test_hook.sh
index 5d22130..898524e 100755
--- a/ceilometer/tests/integration/hooks/post_test_hook.sh
+++ b/ceilometer/tests/integration/hooks/post_test_hook.sh
@@ -81,7 +81,7 @@
     # Be sure to source Gnocchi settings before
     source $BASE/new/gnocchi/devstack/settings
     echo "* Unprocessed measures:"
-    find $GNOCCHI_DATA_DIR
+    sudo find $GNOCCHI_DATA_DIR
 
     set -x
 fi