Log Message:
sysutils/ruby-chef-config: update to 16.0.287

Update 16.0.287.

Latest rubygems version is 16.1.0 but it chef require unpulished
bcrypt_pbkdf gem 1.1.0.rc1.  So, update to 16.0.287.

For more detail, please refer:
<https://github.com/chef/chef/blob/master/CHANGELOG.md>