Merge branch 'add_unittest' into 'branch-0.3.1'

fix build error

See merge request megasearch/milvus!173

Former-commit-id: 95331af7478d44bba3fdfc164cef985f9194c738

cpp/src/utils/ValidationUtil.cpp

@@ -59,7 +59,7 @@ ValidateTableIndexType(int32_t index_type) {
     auto engine_type = engine::EngineType(index_type);
     switch (engine_type) {
         case engine::EngineType::FAISS_IDMAP:
-        case engine::EngineType::FAISS_IVFFLAT: {
+        case engine::EngineType::FAISS_IVFFLAT_GPU: {
             SERVER_LOG_DEBUG << "Index type: " << index_type;
             return SERVER_SUCCESS;
         }

knowhere @ 3a052d06

-Subproject commit 3a30677b8ab105955534922d1677e8fa99ef0406
+Subproject commit 3a052d063ff9b360529a4a120f9703f00c603437