Fix a bunch of issues with the initial data collection for ground truth

- In particular, the iOS battery level was never read, so we always got -100
- The android key was always "sensor_config" (because when we updated the
  read timestamp on the document, it updated everything including the key)
    e-mission/cordova-usercache#14

bin/historical/fix_ios_broken_battery.py

@@ -0,0 +1,4 @@
+import emission.core.get_database as edb
+
+edb.get_timeseries_db().remove({'metadata.key': 'background/battery',
+                                'data.battery_level_pct': -100})

bin/historical/fix_sensor_config_key.py

@@ -0,0 +1,25 @@
+import emission.core.get_database as edb
+
+
+def fix_key(check_field, new_key):
+    print "First entry for "+new_key+" is %s" % list(edb.get_timeseries_db().find(
+                                    {"metadata.key": "config/sensor_config",
+                                    check_field: {"$exists": True}}).sort(
+                                        "metadata/write_ts").limit(1))
+    udb = edb.get_usercache_db()
+    tdb = edb.get_timeseries_db()
+    for i, entry in enumerate(edb.get_timeseries_db().find(
+                                    {"metadata.key": "config/sensor_config",
+                                    check_field: {"$exists": True}})):
+        entry["metadata"]["key"] = new_key
+        if i % 10000 == 0:
+            print udb.insert(entry)
+            print tdb.remove(entry["_id"])
+        else:
+            udb.insert(entry)
+            tdb.remove(entry["_id"])
+
+fix_key("data.battery_status", "background/battery")
+fix_key("data.latitude", "background/location")
+fix_key("data.zzaEh", "background/motion_activity")
+fix_key("data.currState", "statemachine/transition")