Switch to python3

Signed-off-by: Tom Joseph <tomjoseph@in.ibm.com>
Change-Id: I86ca25173c745442760eddd608ad48985cd46ee0
diff --git a/scripts/inventorysensor.mako.cpp b/scripts/inventorysensor.mako.cpp
index f1ea8cd..68af3e8 100644
--- a/scripts/inventorysensor.mako.cpp
+++ b/scripts/inventorysensor.mako.cpp
@@ -7,7 +7,7 @@
 using namespace ipmi::sensor;
 
 extern const InvObjectIDMap invSensors = {
-% for key in sensorDict.iterkeys():
+% for key in sensorDict.keys():
    % if key:
 {"${key}",
     {