Revert "Implement set Wifi on/off."

This reverts commit 4c7af64d0d958a9db6de0bc3fddfa1aa0edb1cdd.

lib/roles/device/plugins/service.js

@@ -521,20 +521,6 @@ module.exports = syrup.serial()
         })
     }
 
-    plugin.setWifiEnabled = function(enabled) {
-      return runServiceCommand(
-          apk.wire.MessageType.SET_WIFI_ENABLED
-        , new apk.wire.SetWifiEnabledRequest(enabled)
-        )
-        .timeout(10000)
-        .then(function(data) {
-          var response = apk.wire.SetWifiEnabledResponse.decode(data)
-          if (!response.success) {
-            throw new Error('Unable to set Wifi')
-          }
-        })
-    }
-
     function runServiceCommand(type, cmd) {
       var resolver = Promise.defer()
       var id = Math.floor(Math.random() * 0xFFFFFF)