Remove CSIBlockVolume from tech preview in 4.2

[bertinatto]

CSIBlockVolume support was enabled in 4.1 via this PR: #278

This feature is alpha in k8s v1.13 (Openshift 4.1), however, the feature turned beta in v1.14 (which 4.2 is based on).

Since we're looking into making this feature generally available for Openshift 4.2, I believe we should remove this line from the tech preview list of features.

CC @j-griffith, @humblec, @jarrpa, @openshift/storage

[bertinatto]

/assign @eparis

[humblec]

LGTM !! Thanks @bertinatto

[bertinatto]

@eparis, can you check if this makes sense, please?

[bertinatto]

/assign @deads2k @sttts

[deads2k]

/lgtm

You'll need to bump the operators of affected binaries and whatever drives the kubelet.

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[bertinatto]

OK, checking which components I need to bump.

[eparis]

I don't think we really care if they get bumped. Since this is enabled by default in 4.2 having this present or not is irrelevant, no?

[bertinatto]

I don't think we really care if they get bumped. Since this is enabled by default in 4.2 having this present or not is irrelevant, no?

After looking into this for a while, that's my understanding as well.

As far as I understand, it would be relevant if it was the other way around (enabling a previously disabled feature, for example). @deads2k, are we missing anything here?