Merge branch 'branch-0.4.0' into 'branch-0.4.0'

fix unitest failure

See merge request megasearch/milvus!545

Former-commit-id: 9d88c49b75d57513f0758ebe942523b8f182854f

cpp/unittest/server/appendix/server_config.yaml

@@ -34,7 +34,6 @@ cache_config:
   gpu_cache_free_percent: 0.85      # old data will be erased from cache when cache is full, this value specify how much memory should be kept, range: greater than zero ~ 1.0
   gpu_ids:                          # gpu id
     - 0
-    - 1
 
 engine_config:
   use_blas_threshold: 20