[COOK-3500]

Rotate logs using `logrotate_app` definition.

If `chef_client['log_file']` is set on a platform supported by logrotate
cookbook, chef-client should use logrotate_app definition to rotate
client logs.

Added and documented attributes:

* chef_client['logrotate']['rotate'] = 12
* chef_client['logrotate']['frequency'] = "weekly"