Fixed gate by Updating Gemfile to pin Rake to 10.1.1
Fixed gate by Updating Gemfile to pin Rake to 10.1.1

The latest Rake update requires Ruby >= 1.9. Bundler in the
current gate uses 1.8.x. This update fixes the gate by pinning
Rake to the last known working version.

Change-Id: I7b4495364221fbe99e2212df75772a5853f4cbac

varunarya10/puppet-cinder,TelekomCloud/puppet-cinder