Block volumes are marked with FileSystemResizeRequired

[wongma7]

The in-tree controller, after finishing Controller expand, checks not only if the plugin reports that FS resize is required but also if the volume is mode FS or not: https://github.com/kubernetes/kubernetes/blob/1dac5fd14a54ac4972339dbe55f9f03688fd7542/pkg/volume/util/operationexecutor/operation_generator.go#L1578 before it marks volumes FileSystemResizeRequired.

The external-resizer should do the same.

This was caught by the e2e test
[Driver: aws] [Testpattern: Dynamic PV (block volmode)(allowExpansion)] volume-expand [It] Verify if offline PVC expansion works

/assign

[msau42]

I think @gnufied was also looking into this

[wongma7]

ok, looks like a 1-liner to me so let's discuss in #47

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