Add cpu_entitlement and log_rate to process stats test

Author: sneal

testutil/template/process_stats.json

@@ -7,8 +7,10 @@
       "usage": {
         "time": "2016-03-23T23:17:30.476314154Z",
         "cpu": 0.00038711029163348665,
+        "cpu_entitlement": 0.01117396940977856,
         "mem": 19177472,
-        "disk": 69705728
+        "disk": 69705728,
+        "log_rate": 0
       },
       "host": "10.244.16.10",
       "instance_ports": [