Sensu no longer monitors `jenkins.kazu634.com`.
Modify the redis configuration in order for it to start successfully.

The official redis cookbook somehow deploy the configuration file,
part of whose settings is not supported by the older version redis.

In order to successfully start redis,
this commit patchs the redis configuration file.
[common] Deleted <root>/test directory.
[common] Install `test-kitchen`, etc.

- Install `test-kitchen`
- Update `Gemfile.lock`
- Update `.chef/knife.rb`
- Modify the `berks` command options
[Base] Support the test-kitchen.

- Add `.kitchen.yml`
- Install dependent cookbooks via `Berkshelf`
- Add tests for `base` cookbook

In order to enable automated tests:

- Do not change SSH port, when testing environment.
[temporary] modigy `.gitignore`