storage/pv-migrator - init add

[itewk]

Adds ansible to migrate PVs to a specified new storage class.

[itewk]

@etsauer here is the MR i promised you.

[itewk]

@etsauer thoughts?

[etsauer]

@itewk this looks good. I've asked someone to try and test it, and will follow up shortly.

[itewk]

@etsauer sounds good. So far I am the only one who has used it, client is gearing up to use it in next couple of weeks.

[itewk]

@etsauer anyone get a chance to test this?

[itewk]

@etsauer thank you.