Firewall authorization should be idempotent
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Key: WHIRR-249
URL: https://issues.apache.org/jira/browse/WHIRR-249
Project: Whirr
Issue Type: Bug
Reporter: Tom White
Sometimes firewall rules are left over from a previous cluster that wasn't shut
down properly, leading to cluster launch failure. This can be fixed by making
FirewallSettings.authorizeIngress idempotent.
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