run memory_tracker as root

In order to get memlocked pages this needs to be run as root, just
start it as root so that we don't have issues with the inability to
run sudo later in the run.

Change-Id: I7adab8cbb6d89d4717e427aec22e316d27bea075
diff --git a/lib/dstat b/lib/dstat
index 62795f5..517e423 100644
--- a/lib/dstat
+++ b/lib/dstat
@@ -24,12 +24,12 @@
     # To enable memory_tracker add:
     #    enable_service memory_tracker
     # to your localrc
-    run_process memory_tracker "$TOP_DIR/tools/memory_tracker.sh"
+    run_process memory_tracker "sudo $TOP_DIR/tools/memory_tracker.sh"
 
     # remove support for the old name when it's no longer used (sometime in Queens)
     if is_service_enabled peakmem_tracker; then
         deprecated "Use of peakmem_tracker in devstack is deprecated, use memory_tracker instead"
-        run_process peakmem_tracker "$TOP_DIR/tools/memory_tracker.sh"
+        run_process peakmem_tracker "sudo $TOP_DIR/tools/memory_tracker.sh"
     fi
 }
 
diff --git a/tools/memory_tracker.sh b/tools/memory_tracker.sh
index dac0267..7397c03 100755
--- a/tools/memory_tracker.sh
+++ b/tools/memory_tracker.sh
@@ -86,7 +86,7 @@
             # list processes that lock memory from swap
             if [[ $unevictable -ne $unevictable_point ]]; then
                 unevictable_point=$unevictable
-                sudo ./tools/mlock_report.py
+                ./tools/mlock_report.py
             fi
 
             echo "]]]"