Fix verbs for recent storage change

1) Initialize the storage class in verbs with the extra needed args
2) Make the CloudFrontedS3Storage resilient to those extra args being missing

storage/cloud.py

@@ -613,9 +613,15 @@ class CloudFrontedS3Storage(S3Storage):
 
   def get_direct_download_url(self, path, request_ip=None, expires_in=60, requires_cors=False,
                               head=False):
+    # If CloudFront could not be loaded, fall back to normal S3.
+    if self.cloudfront_privatekey is None:
+      return super(CloudFrontedS3Storage, self).get_direct_download_url(path, request_ip,
+                                                                        expires_in, requires_cors,
+                                                                        head)
+      
     resolved_ip_info = None
     logger.debug('Got direct download request for path "%s" with IP "%s"', path, request_ip)
-    if request_ip is not None:
+    if request_ip is not None and self._context.ip_resolver is not None:
       # Lookup the IP address in our resolution table and determine whether it is under AWS. If it is,
       # then return an S3 signed URL, since we are in-network.
       resolved_ip_info = self._context.ip_resolver.resolve_ip(request_ip)
@@ -652,6 +658,9 @@ class CloudFrontedS3Storage(S3Storage):
     """ Returns the private key, loaded from the config provider, used to sign direct
         download URLs to CloudFront.
     """
+    if self._context.config_provider is None:
+      return None
+
     with self._context.config_provider.get_volume_file(cloudfront_privatekey_filename) as key_file:
         return serialization.load_pem_private_key(
             key_file.read(),