• Add VIR_ERR_AUTH_UNAVAILABLE constant
  
• Add VIR_DOMAIN_SCHEDULER_GLOBAL_PERIOD, VIR_DOMAIN_SCHEDULER_GLOBAL_QUOTA,
  VIR_DOMAIN_TUNABLE_CPU_GLOBAL_PERIOD & VIR_DOMAIN_TUNABLE_CPU_GLOBAL_QUOTA
  constants
  
• Add VIR_DOMAIN_EVENT_ID_JOB_COMPLETED constant and callback
  
• Add VIR_ERR_NO_SERVER constant
  
• Add VIR_DOMAIN_EVENT_DEFINED_FROM_SNAPSHOT constant
  
• Add VIR_MIGRATE_PARAM_DISKS_PORT constant
  
• Add virDomainMigrateStartPostCopy API support
  
• Add constants related to post-copy migration
  
• Add APIS & constants for new perf event support