fix flake8 errors

agentdriver.py

@@ -11,6 +11,8 @@ SOCKET_DIR = getenv('SOCKET_DIR', '/var/lib/libvirt/serial')
 
 
 old_install_platform_tweaks = Worker.install_platform_tweaks
+
+
 def install_platform_tweaks(self, worker):
     self.worker = worker
     old_install_platform_tweaks(self, worker)

protocol.py

@@ -7,7 +7,7 @@ import time
 import struct
 from utils import SerialLineReceiverBase
 
-from agentcelery import agent_started, agent_stopped, agent_ok
+from agentcelery import agent_started, agent_stopped
 
 logger = logging.getLogger(__name__)