net/zerotier: register device from plugin

net/zerotier/Makefile

@@ -1,6 +1,6 @@
 PLUGIN_NAME=		zerotier
 PLUGIN_VERSION=		1.3.2
-PLUGIN_REVISION=	3
+PLUGIN_REVISION=	4
 PLUGIN_COMMENT=		Virtual Networks That Just Work
 PLUGIN_DEPENDS=		zerotier
 PLUGIN_MAINTAINER=	dharrigan@gmail.com

net/zerotier/src/etc/inc/plugins.inc.d/zerotier.inc

@@ -59,3 +59,8 @@ function zerotier_services()
 
     return $services;
 }
+
+function zerotier_devices()
+{
+    return [['pattern' => '^zt', 'volatile' => true]];
+}