Reduce severity for "Encountered enum member {} which is not modeled in your clients"

I've seen tons of "Encountered enum member CRC64NVME which is not
modeled in your clients" messages

Idealy we need to update aws-sdk, but it will take time, and it cannot
be backported.

Author: azat

src/aws-cpp-sdk-core/source/utils/EnumParseOverflowContainer.cpp

@@ -28,6 +28,6 @@ const Aws::String& EnumParseOverflowContainer::RetrieveOverflow(int hashCode) co
 void EnumParseOverflowContainer::StoreOverflow(int hashCode, const Aws::String& value)
 {
     WriterLockGuard guard(m_overflowLock);
-    AWS_LOGSTREAM_WARN(LOG_TAG, "Encountered enum member " << value << " which is not modeled in your clients. You should update your clients when you get a chance.");
+    AWS_LOGSTREAM_DEBUG(LOG_TAG, "Encountered enum member " << value << " which is not modeled in your clients. You should update your clients when you get a chance.");
     m_overflowMap[hashCode] = value;
 }