Hosts to retire:
* Ops steps
**  All system services confirmed offline from production use (MySQL is now stopped)
**  Set all icinga checks to maint mode/disabled while reclaim/decommmission takes place.
**  Remove system from all lvs/pybal active configuration
**  Any service group puppet/hiera/dsh config removed
**  Update site.pp with `role::spare::system`
* DC ops
**  Disable puppet on host
**  Remove all remaining puppet references (include `role::spare:system`)
**  Power down host
**  Disable switch port
**  Switch port assignment noted on this task (for later removal)
**  Remove production dns entries
**  Puppet node clean, puppet node deactivate
**  System disks wiped (by onsite)
**  System unracked and decommissioned (by onsite), update racktables with result
**  Switch port configration removed from switch once system is unracked.
**  Mgmt dns entries removed.