r/internet_gateway: Retry properly on DependencyViolation #1021
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Fixes #181
Root cause of the bug is described in #945 (comment)
In addition to retrying I also added some extra debugging info which should help us in case this problem reoccurs - at least we'll know what ENIs are lying around and what/who created them.
I can confirm through my repro case + debug logs provided by @s-urbaniak that ELB (public one) is one service which can leave IPs around for a while and cause this error, but @s-urbaniak also mentioned that NAT Gateway can be blamed in coreos/tectonic-installer#1017 (comment) so this is possibly wide-spread problem throughout AWS services which allocate public IPs.
btw. We previously ignored unknown errors before, so I'm fixing that too in this PR.