Log Message:
Update ruby21-base to 2.1.7 (Ruby 2.1.7).

Release announce:

Ruby 2.1.7 Released

Posted by usa on 18 Aug 2015

Ruby 2.1.7 has been released.

This release includes the security fix for a RubyGems domain name
verification vulnerability. Please view the topic below for more details.

    CVE-2015-3900 Request hijacking vulnerability in RubyGems 2.4.6 and earlier

And, many bug fixes are also included. See tickets and ChangeLog for details.