cloud-init, test: replace `Expect(len(..).To(Equal(..))` with `Expect(..).To(HaveLen(..))`
cloud-init, test: replace `Expect(len(..).To(Equal(..))` with `Expect(..).To(HaveLen(..))`

Replace occurrences of `Expect(len($VAR)).To(Equal($X))` with
`Expect($VAR).To(HaveLen($X)` which is more gomega-idiomatic and gives
better error messages when the expectation fails.

Use the `BeEmpty()` matcher where the expected len is 0.

Signed-off-by: Antonio Cardace <c1692accd51a623bf82e7e7c9b13c3c3a1045937@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt