fix(GCS): disable md5 and crc checking temporarily

Waiting on googleapis/python-storage#258
Until that patch is released, GCS will error on perfectly good
files randomly if + or / characters are included in the base64
representation of the hash.

cloudfiles/interfaces.py

@@ -392,14 +392,14 @@ def get_file(self, file_path, start=None, end=None):
     except google.cloud.exceptions.NotFound as err:
       return (None, None, None, None)
 
-    hash_type = "md5"
-    hash_value = blob.md5_hash if blob.component_count is None else None
+    # hash_type = "md5"
+    # hash_value = blob.md5_hash if blob.component_count is None else None
 
-    if hash_value is None and blob.crc32c is not None:
-      hash_type = "crc32c"
-      hash_value = blob.crc32c
+    # if hash_value is None and blob.crc32c is not None:
+    #   hash_type = "crc32c"
+    #   hash_value = blob.crc32c
 
-    return (content, blob.content_encoding, hash_value, hash_type)
+    return (content, blob.content_encoding, None, None)
 
   @retry
   def size(self, file_path):