Retain Challenge resources for debugging if an Order enters an invalid state #1197
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What this PR does / why we need it:
Previously we deleted all Challenge resources for an Order once the Order enters any 'final' state (including failed).
This makes it harder for users to debug order failures once the order transitions to the invalid state.
@goblain brought this up on slack: https://kubernetes.slack.com/archives/C4NV3DWUC/p1547213252391000
Release note:
/area provider-acme