Terraform-compliance

* Changed `encryption is enabled` step to `{property} is enabled` where `{property}` could be generic and templated. ([123](https://github.com/eerkunt/terraform-compliance/issues/123))

* Fixed a failure message where it was misleading. (follow up on [127](https://github.com/eerkunt/terraform-compliance/issues/127#issuecomment-511990432))

* Fixed a bug where a resource might have multiple values (with same key). (follow up on [126](https://github.com/eerkunt/terraform-compliance/issues/126))
* Improved `its value must not be null` step that is also checking if the value is set to `''`.

* Fixed a bug where terraform-compliance crashes while reading the terraform file on terraform resources that does not have `values` key ([124](https://github.com/eerkunt/terraform-compliance/issues/124))
* Fixed a bug where some resources with key/value pair property causes a problem as reported in ([127](https://github.com/eerkunt/terraform-compliance/issues/127))

* Fixed a bug where 'it must contain <something>' fails because of a KeyError.
* Fixed a bug where a test might fail while changing a resource that already exists in the remote/local terraform state.

* Set static versions fo dependencies within the setup.py and disabled re-install function completely.