Can we kope better with existing VPCs, in terms of assigning subnet CIDRs

[justinsb]

Would be nice to try to pick non-overlapping subnets, or to at least warn.

[mattjonesorg]

I'd rather have issue #232 to work better with our environment.

[kenden]

Would be fixed by #2395

[blakebarnett]

If someone would like to re-open #2395 and finish it off that'd be awesome.

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[chrislovecnm]

/lifecycle frozen
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