Add missing influxdb_migrator (#4555)

* Add missing influxdb_migrator

* remove redirect

source/_docs/tools/influxdb_migrator.markdown

@@ -0,0 +1,39 @@
+---
+layout: page
+title: "influxdb_migrator"
+description: "Script to convert an old-structure Influx database to a new one."
+release_date: 2017-02-23 11:00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+---
+
+Script to convert an old-structure Influx database to a new one.
+
+Example to run the script:
+
+```bash
+$ hass --script influxdb_migrator -H IP_INFLUXDB_HOST \
+    -u INFLUXDB_USERNAME -p INFLUXDB_PASSWORD \
+    --dbname INFLUXDB_DB_NAME
+```
+Script arguments:
+
+```
+optional arguments:
+  -h, --help            show this help message and exit
+  -d dbname, --dbname dbname
+                        InfluxDB database name
+  -H host, --host host  InfluxDB host address
+  -P port, --port port  InfluxDB host port
+  -u username, --username username
+                        InfluxDB username
+  -p password, --password password
+                        InfluxDB password
+  -s step, --step step  How many points to migrate at the same time
+  -o override_measurement, --override-measurement override_measurement
+                        Store all your points in the same measurement
+  -D, --delete          Delete old database
+```
+

source/_includes/asides/docs_navigation.html

@@ -93,6 +93,7 @@
           <li>{% active_link /docs/tools/db_migrator/ db_migrator %}</li>
           <li>{% active_link /docs/tools/ensure_config/ ensure_config %}</li>
           <li>{% active_link /docs/tools/influxdb_import/ influxdb_import %}</li>
+          <li>{% active_link /docs/tools/influxdb_migrator/ influxdb_migrator %}</li>
           <li>{% active_link /docs/tools/keyring/ keyring %}</li>
         </ul>
       </li>