Lint: F821 undefined name 'config'

This variable is set after importing these files by the flaskapi module.
Thus, simply set a default at the top of each file to avoid linting
errors.

api-daemon/pvcapid/helper.py

@@ -34,6 +34,8 @@ import daemon_lib.vm as pvc_vm
 import daemon_lib.network as pvc_network
 import daemon_lib.ceph as pvc_ceph
 
+config = None  # Set in this namespace by flaskapi
+
 def strtobool(stringv):
     if stringv is None:
         return False