Add UniFi discovery service (#1454)

hassio/discovery/services/unifi.py

@@ -0,0 +1,11 @@
+"""Discovery service for UniFi."""
+import voluptuous as vol
+
+from hassio.validate import network_port
+
+from ..const import ATTR_HOST, ATTR_PORT
+
+
+SCHEMA = vol.Schema(
+    {vol.Required(ATTR_HOST): vol.Coerce(str), vol.Required(ATTR_PORT): network_port}
+)