Fix its key condition be value

[Kudbettin]

Addresses #295 and is related to the discussions in #291, #292. (invalidates some responses)

Two rules were kept in mind:

• Then always drills down: Drilling down to value and not key
• Then fails if any resources fail, unless specified otherwise

Two questions about the changes:

1. I am not sure if it would be better to return/drill down to the found values, or a formatted version of them:

{
     address: old_address.key
     type: key(?)
     values: found_values
}

2. Should unit tests be added here? (e.g. check if number of resources are conserved, check if resources are correctly drilled down to the value)

[coveralls]

Pull Request Test Coverage Report for Build 1062

• 0 of 26 (0.0%) changed or added relevant lines in 1 file are covered.
• 6 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.06%) to 59.86%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
terraform_compliance/steps/then/its_key_condition_be_value.py	0	26	0.0%

Files with Coverage Reduction	New Missed Lines	%
terraform_compliance/common/defaults.py	6	83.33%

Totals
Change from base Build 1057:	0.06%
Covered Lines:	1193
Relevant Lines:	1993

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💛 - Coveralls

[Kudbettin]

Resources after drill down are now correctly not forced to be 1:1. Drilling down a resource can pass more than one resource to the next step.