v1.0: fix test

Signed-off-by: lhy1024 <[email protected]>

v4.0.1

• Prevent misconfiguration of Placement Rules in some situations #2516
• Fix the issue that deleting the Placement Rule might cause panic #2515
• Support the internal proxy for the built-in TiDB Dashboard #2511
• Support setting a custom timeout for PD client #2509
• Fix bug that can not get store information when store's used size is zero #2474