Translations:ReleaseNotes/Liberty/27/en

Architectural evolution on the scheduler has continued, along with key bug fixes:
 * Adds object model for a launch request spec (partially complete) (https://blueprints.launchpad.net/nova/+spec/request-spec-object)
 * Move resource allocation ratios from scheduler to resource tracker (https://blueprints.launchpad.net/nova/+spec/allocation-ratio-to-resource-tracker)
 * Fix resource tracking for operations that move instances between hosts (https://blueprints.launchpad.net/nova/+spec/migration-fix-resource-tracking)
 * Improved user feedback when returning NoValidHost from the scheduler (http://specs.openstack.org/openstack/nova-specs/specs/liberty/approved/add_exceeded_max_retries_exception.html).