Extend Reset protocol to include "mode"

Some forms of reset can reset the device into different modes. For example:
- Reboot
- Reboot into bootloader mode
- Reboot into recovery mode

Signed-off-by: Sebastian Goscik <[email protected]>

Author: ep1cman

labgrid/protocol/resetprotocol.py

@@ -3,5 +3,5 @@
 
 class ResetProtocol(abc.ABC):
     @abc.abstractmethod
-    def reset(self):
+    def reset(self, mode=None):
         raise NotImplementedError