spread instances equally to all AZs

[zetaab]

fixes issue #6533

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After:

/sig openstack

/cc @drekle please review

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In response to this:

fixes issue #6533

Before:

After:

/sig openstack

/cc @drekle please review

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[zetaab]

@drekle can you check now again? Of course we could add zone information to ig.Spec.Zones (its only added in case of GCP). However, in case of openstack this information is already in place in subnets.

[drekle]

/lgtm