message: blobcache: don't try deserialize from "cache_compressed" from config
  Whether to to validate cache when read is up to Rafs layer configuration.
  If we can also get the configuration from cache general configuration, it
  will puzzles our users and could be hard to control the behavior
diff: @@ -55,14 +55,16 @@ impl BackendConfig {
  #[derive(Default, Clone, Deserialize)]
  pub struct CacheConfig {
  - #[serde(default, rename = "validate")]
  - pub cache_validate: bool,
  #[serde(default, rename = "compressed")]
  pub cache_compressed: bool,
  #[serde(default, rename = "type")]
  pub cache_type: String,
  #[serde(default, rename = "config")]
  pub cache_config: Value,
  + // Whether to validate cache is up to upper layer - Rafs. So don't try to
  + // get it from a user configuration file.
  + #[serde(skip_serializing, skip_deserializing)]
  + pub cache_validate: bool,
  #[serde(skip_serializing, skip_deserializing)]
  pub prefetch_worker: PrefetchWorker,
  }
  