Fix path to mlock_report

This patch fixes path to mlock_report.py. Also add python-psutil
to dstat depends as it is required by mlock_report.

Change-Id: Ia2b507a7b923f1e3393a9cb7746c66d39d6abfde
diff --git a/files/rpms/dstat b/files/rpms/dstat
index 2b643b8..0d9da44 100644
--- a/files/rpms/dstat
+++ b/files/rpms/dstat
@@ -1 +1,2 @@
 dstat
+python-psutil