dfc-fermata: add bluetooth fields

Adds 2 fields to the dynamic config (as described in e-mission/e-mission-docs#1062)

For vehicle identities, I have only added 1 so far: my own car with the Accent beacon I have in my possession.
I will configure this beacon with the UUID described here e-mission/e-mission-data-collection#220 (comment); and with the major and minor values I put in the config ("dfc0:fff0")
Will add others' vehicles once I have that information.

Also sets "tracking" . "bluetooth_only" to true, to signify that we will not track trips unless one of these vehicles is recognized.

configs/dfc-fermata.nrel-op.json

@@ -85,6 +85,28 @@
     },
     "trip-labels": "ENKETO"
   },
+  "vehicle_identities": [
+    {
+      "value": "car_jacks_mazda3",
+      "bluetooth_major_minor": ["dfc0:fff0"],
+      "name": "Jack's Mazda 3",
+      "baseMode":"CAR",
+      "met_equivalent":"IN_VEHICLE",
+      "kgCo2PerKm": 0.22031,
+      "vehicle_info": {
+        "type": "car",
+        "license": "JHK ****",
+        "make": "Mazda",
+        "model": "3",
+        "year": 2014,
+        "color": "red",
+        "engine": "ICE"
+      }
+    }
+  ],
+  "tracking": {
+    "bluetooth_only": true
+  },
   "display_config": {
     "use_imperial": true
   },