Don't exclude anything from logcat unless filters are given.

lib/roles/device/plugins/logcat.js

@@ -64,12 +64,14 @@ module.exports = syrup.serial()
       if (plugin.isRunning()) {
         activeLogcat
           .resetFilters()
-          .excludeAll()
 
+        if (filters.length) {
+          activeLogcat.excludeAll()
           filters.forEach(function(filter) {
             activeLogcat.include(filter.tag, filter.priority)
           })
         }
+      }
       else {
         throw new Error('Logcat is not running')
       }