Added ensure_keys function

copy_local_keys.py

@@ -1,4 +1,5 @@
 import os
+from functools import partial
 
 
 def mod_time(path):
@@ -19,3 +20,7 @@ def find_newest_cert(root_dir, hostname):
                 elif mod_time(fullpath) > mod_time(look_for[file]):
                     look_for[file] = fullpath
     return look_for
+
+
+def ensure_keys(key_dir, hostname):
+    files = (part.format(hostname) for part in ("{}.key.pem", "{}.chain.pem"))