Faster mounting

[Kudbettin]

Large plan files with lots of references may take too much time to mount.
Following is an attempt to reduce it. (Processing my plan file went from taking 90 seconds to 4 seconds)

Using raw_resources instead of resources to prevent having too much information within the resources. (i.e. discard nested mountings and cycle references)

I believe cycle referencing shouldn't be a problem. Older versions don't seem to fully support it, so I won't either. Example of how cycle references could be handled. (Changes the application behavior a bit.)

[coveralls]

Pull Request Test Coverage Report for Build 1183

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 6 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.3%) to 57.369%

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Files with Coverage Reduction	New Missed Lines	%
terraform_compliance/common/defaults.py	6	85.0%

Totals
Change from base Build 1179:	0.3%
Covered Lines:	1339
Relevant Lines:	2334

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💛 - Coveralls