netcelery, vmcelery: fix flake8 warnings

netcelery.py

@@ -22,6 +22,7 @@ AMQP_URI = getenv('AMQP_URI')
 def to_bool(value):
     return value.lower() in ("true", "yes", "y", "t")
 
+
 lib_connection = None
 native_ovs = False
 

vmcelery.py

@@ -9,6 +9,7 @@ from argparse import ArgumentParser
 def to_bool(value):
     return value.lower() in ("true", "yes", "y", "t")
 
+
 if to_bool(getenv("LIBVIRT_TEST", "False")):
     HOSTNAME = "vmdriver.test"
 else: