Ignore module initialization when settings ignore_module

[wata727]

Ref: #161

There was no way to solve it when module detection failed due to TFLint problem. This p-r also applies ignore_module to module initialization.

Before

$ tflint --ignore-module=hashicorp/consule/aws
ERROR: module `hashicorp/consul/aws` not found. Did you run `terraform get`?

After

$ tflint --ignore-module=hashicorp/consule/aws
Awesome! Your code is following the best practices :)