Fix errors in Route53 provider

[amiryal]

Hi,

I stumbled upon a bug in the route53 provider, where managed records kept being destroyed and re-created on every Puppet run, even though they were correct in the actual DNS zone. This PR contains the fix that works for me.

I split the patch into several commits: one cosmetic, one for the actual fix, and one with the changes in debug/info messages that helped me identify the problem.

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