FD3-393 se cambio length de campo ponSerialNumber a 16

src/FTTHBundle/Entity/ONU.php

@@ -72,7 +72,7 @@ class ONU implements DeviceInterface, TenancyIdTraitInterface, LocationInterface
     /**
      * @var string
      *
-     * @ORM\Column(type="string", length=12, nullable=false, unique=true)
+     * @ORM\Column(type="string", length=16, nullable=false, unique=true)
      */
     private $ponSerialNumber;