Failed Upgrade from v0.8.1 to v1.0.0 caused by pv created before v0.6.2

The link we used to migrate volume for before v0.6.2.

@akhfa The upgrade instruction was supposed to be executed before the upgrade, that might be the reason it failed. We will look into it.

@shuo-wu Can you check the upgrade steps still valid for v1.0.0? Since we’ve removed the compatible CSI driver in v1.0.0.