Merge branch 'fix_log_level' into 'master'

change error logs to warning ones in read opencl files

See merge request !1162

mace/core/kv_storage.cc

@@ -106,7 +106,7 @@ int FileStorage::Load() {
   auto status = fs->NewReadOnlyMemoryRegionFromFile(
       file_path_.c_str(), &kv_data);
   if (status != MaceStatus::MACE_SUCCESS)  {
-    LOG(ERROR) << "Failed to read kv store file: " << file_path_;
+    LOG(WARNING) << "Failed to read kv store file: " << file_path_;
     return -1;
   } else {
     ParseKVData(static_cast<const unsigned char *>(kv_data->data()),

mace/utils/tuner.h

@@ -167,8 +167,8 @@ class Tuner {
       auto status = fs->NewReadOnlyMemoryRegionFromFile(
           tuned_param_file_path_.c_str(), &param_data);
       if (status != MaceStatus::MACE_SUCCESS)  {
-        LOG(ERROR) << "Failed to read tuned param file: "
-                   << tuned_param_file_path_;
+        LOG(WARNING) << "Failed to read tuned param file: "
+                     << tuned_param_file_path_;
         return;
       } else {
         ParseData(static_cast<const unsigned char *>(param_data->data()),