auto-configure providers during binary acctests

[kmoe]

Fixes #352.

This runs Configure() on providers prior to the binary acctest run, so they can access provider.Meta() during tests.

The one nuance to be aware of here is that PreCheck() is called after the auto-configure, in case providers are already using this for custom configuration.

Note

Once this is approved I'll generate CHANGELOG and raise another PR to the version2 branch.

[appilon]

The code is sort of diverged in V2 (there's no else case). Not sure if that lands just in another PR or via cherry picks? Defer to your git expertise on how to make this go the cleanest, I just wanna avoid conflicts the day we PR version2 into master.

[kmoe]

I'll just raise another PR to version2 manually - no need for git magic here as it's a simple change.

[ghost]

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