storage: add pull and deletes plus tests to storageclass

[klaskosk]

Added a PullClass function to the storage package; added Delete, DeleteAndWait, and WaitUntilDeleted methods to ClassBuilder; and added unit tests for all of the functions in storageclass.go.

[kononovn]

Looks good just few changes are needed.

[klaskosk]

@kononovn Updated the test, although there's no check for a nil client in NewClassBuilder since the apiClient field hasn't been narrowed so it would be redundant with validate

[kononovn]

@kononovn Updated the test, although there's no check for a nil client in NewClassBuilder since the apiClient field hasn't been narrowed so it would be redundant with validate

I know just to make it more consistent can you add to NewBuilder following condition?

eco-goinfra/pkg/assisted/agentclusterinstall.go

Line 51 in 30c5d20

if apiClient == nil {

[kononovn]

please check comment above.

[kononovn]

/lgtm

[trewest]

/lgtm