Save the date if changed even signature didn't. Check of signatures after upgrader has a concurrence problem, as files might be already upgrade while check on this stage.

  daemon can conflict with the the function available on centos functions.

otherwise yum-config-manager is not found sometimes.

  In case download from shacache fails, the upgrade should safely stop and be able to run again

  Include Debian 7 and 8
  Include ansible playbook to automate the build
  Include Ubuntu 15.04 and Ubuntu 14.04
  Include configuration for CentOS 6.7 and 7.2