MS-515 & MS-516 Fix index building gpu config issue

Former-commit-id: 50656bfaac7aba28682c4e5d2dbdec5b1c48244a

cpp/src/server/ServerConfig.cpp

@@ -128,6 +128,7 @@ ErrorCode ServerConfig::ValidateConfig() const {
     }
 
     if(!resource_valid_flag) {
+        std::cerr << "Building index GPU can't be found in resource config." << std::endl;
         return SERVER_INVALID_ARGUMENT;
     }
 

cpp/src/utils/ValidationUtil.h

@@ -2,7 +2,6 @@
 
 #include "db/meta/MetaTypes.h"
 #include "Error.h"
-#include "
 
 namespace zilliz {
 namespace milvus {