Add MQTT IP parm

Change-Id: I19ad078ede11f097b0536eedd0ea18f6f252f23d
diff --git a/person_detection/config.py b/person_detection/config.py
index adf48ee..b21fa96 100644
--- a/person_detection/config.py
+++ b/person_detection/config.py
@@ -15,4 +15,4 @@
 ROCUSER = os.environ.get("ROCUSER")
 ROCPASSWORD = os.environ.get("ROCPASSWORD")
 NUMDEVICES = os.environ.get("NUMDEVICES", 1)
-
+MQTTIP = os.environ.get("MQTTIP", "localhost")