Mount FlexVolume directory in kube-controller-manager pod

[kellanburket]

Mounts the FlexVolume directory so that FlexVolumes with attach capability can run on KOPs clusters

[k8s-ci-robot]

Hi @kellanburket. Thanks for your PR.

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[kellanburket]

/assign @KashifSaadat

[kellanburket]

Applies to Issue 6847

[rdrgmnzs]

For clarity controller manager needs access to FlexVolume plugin when using attach-detach controller interface.

/ok-to-test

[KashifSaadat]

Thanks @kellanburket for the PR and apologies for taking so long to review this. I'll aim to validate early next week and drop an update here. 👍

[KashifSaadat]

Sorry for the delay, thanks for the contribution!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: KashifSaadat, kellanburket

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[justinsb]

FYI because of the issues with OSes with read-only filesystems, I cancelled the cherry-pick to 1.14. It should still make it to 1.15-alpha which we're also going to cut soon.