PowerDNS provider

[alkersan]

Please review implementation of proposal #4171 for PowerDNS provider.

• HTTP client for PowerDNS is bundled with provider code, as I didn't find any official nor community implementation. Currently it includes only subset of operations needed by provider.
• acceptance tests include creation of common record types, supported by PowerDNS.
• tested on local PowerDNS Authoritative v3.4.7
• DNSSEC is not covered.
• site documentation section included.

[jen20]

Hi @alkersan! Thanks for opening this pull request! I've rebased this onto master, and made a couple of minor tweaks to formatting and the function which checks whether resources were destroyed after tests. In addition I've set up a containerised acceptance testing environment so we can build this into the nightly build. Because of the rebase, I've pushed to a branch in hashicorp/terraform, so I'll merge that and close this PR. Thanks for your work!

[alkersan]

Thank you @jen20 ! I already despaired about acceptance of this provider. If you have suggestions for improvement - feel free to share, I have some spare time for coding.

[ghost]

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