revent: Added record and replay commands

Added two commands to WA to record and replay input events using revent.

As part of this also added the ability to get a device model from
android and linux device. This may need to be improved in the future.

wlauto/common/android/device.py

@@ -645,6 +645,12 @@ class AndroidDevice(BaseLinuxDevice):  # pylint: disable=W0223
             if se_status == 'Enforcing':
                 self.execute('setenforce 0', as_root=True)
 
+    def get_device_model(self):
+        try:
+            return self.getprop(prop='ro.product.device')
+        except KeyError:
+            return None
+
     # Internal methods: do not use outside of the class.
 
     def _update_build_properties(self, filepath, props):