acctests: Allow using profiles for acceptance tests

[radeksimko]

This was raised in #4939 (comment) but I was generally thinking about this myself for a while.

I absolutely don't want acceptance tests to be picking up the default profile ( ❗ ), but I think it would be practical if we use terraform-acceptance-tests or something similar for this.

This might affect the current acceptance test setup we have in Travis, but probably shouldn't as we use ChainProvider and if the profile isn't present, ENV vars should be just picked up.

This may also fix #4409

[stack72]

@radeksimko I believe this is now solved thanks to @bigkraig and #6383

[bigkraig]

i've been running the acceptance tests using AWS_PROFILE

[stack72]

Me too :)

[ghost]

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