Support change the log level for message "Send requests to storage"

[xiajingchun]

Introduction

When using storage client to scan data, there'll be massive amount of log messages like "Send requests to storage ...".

Contents

The log level is now "INFO", would love to have a way to configure the verbose level of this log message.

Related work

[xiajingchun]

@codesigner Any chance to spare few minutes to fix this? thanks a lot.