feat: add empty and refill unit machine actions

fix: remove certain actions from the state middleware after being consumed by the poller

lib/middlewares/state.js

@@ -15,6 +15,8 @@ module.exports = (function () {
     reboots: {},
     shutdowns: {},
     restartServicesMap: {},
+    emptyUnit: {},
+    refillUnit: {},
     mnemonic: null
   }
 }())