General case sensitivity and centralized matching

[Kudbettin]

Generalized case-sensitivity tag to work on all steps. Centralized matching and seeking functions.

Left the copies of seek functions so that they may be used in other parts of the source (e.g. extensions/terraform.py)

Please take special care at reviewing the changes at control blocks!

[coveralls]

Pull Request Test Coverage Report for Build 1093

• 121 of 205 (59.02%) changed or added relevant lines in 13 files are covered.
• 26 unchanged lines in 6 files lost coverage.
• Overall coverage increased (+0.2%) to 59.685%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
terraform_compliance/common/bdd_tags.py	8	9	88.89%
terraform_compliance/steps/then/property_is_enabled.py	5	6	83.33%
terraform_compliance/steps/given/i_have_name_section_configured.py	5	7	71.43%
terraform_compliance/extensions/terraform.py	6	9	66.67%
terraform_compliance/steps/steps.py	0	3	0.0%
terraform_compliance/steps/then/its_value_condition_match_the_search_regex.py	6	10	60.0%
terraform_compliance/steps/then/its_key_condition_be_value.py	0	5	0.0%
terraform_compliance/steps/when/its_key_is_value.py	14	22	63.64%
terraform_compliance/common/helper.py	62	79	78.48%
terraform_compliance/steps/when/it_contains_something.py	6	23	26.09%

Files with Coverage Reduction	New Missed Lines	%
terraform_compliance/extensions/terraform.py	1	66.38%
terraform_compliance/steps/then/it_must_contain_something.py	1	19.83%
terraform_compliance/steps/when/it_contains_something.py	2	31.44%
terraform_compliance/steps/when/its_key_is_value.py	2	73.33%
terraform_compliance/common/defaults.py	6	84.21%
terraform_compliance/common/helper.py	14	78.6%

Totals
Change from base Build 1089:	0.2%
Covered Lines:	1288
Relevant Lines:	2158

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💛 - Coveralls

[Kudbettin]

Addresses #268

[Kudbettin]

This branch includes some refactoring such as removal of unnecessary Defaults() and jsonify calls.

Behavior of it_must_contain is slightly changed to accommodate lists of (bool, str, int, float)

[eerkunt]

#307