Reconnect when meets store-not-match errors

[youjiali1995]

Now client-go gets store address from PD when it meets store-not-match errors and connections to the store are not recreated if the address is not changed. It's possible the address of store is not changed but the DNS resolves to a different address in k8s environment, so the store-not-match errors can't recover until reconnection. We can always reconnect in this case.