Move recursive init output to debug when there are no changes

[pvickery-ParamountCommerce]

With the current version of tflint, there can be a lot of output even when there are no changes. This PR moves the unneeded logs to DEBUG if there are no changes.

Fixes #2146

❯ tflint --recursive --config=$(pwd)/.tflint.hcl --init

Installing plugins on each working directory...

====================================================
working directory: dir1

Plugin "aws" is already installed
====================================================
working directory: dir2

Plugin "aws" is already installed
====================================================
working directory: dir3

Plugin "aws" is already installed
...

❯ ~/projects/dist/tflint --recursive --config=$(pwd)/.tflint.hcl --init

Installing plugins on each working directory...

All plugins are already installed

[pvickery-ParamountCommerce]

@wata727 I made this PR from your suggestion #2146 (comment)

I just had to change and remove some test cases because of the modified behavior. Let me know what you think