• Add group_name for block iotune
  
• Add new branch instructions perf event
  
• Add PERF_PARAM_BRANCH_MISSES constant
  
• Add PERF_PARAM_BUS_CYCLES constant
  
• Add PERF_PARAM_STALLED_CYCLES_FRONTEND constant
  
• Add PERF_PARAM_STALLED_CYCLES_BACKEND constant
  
• Add PERF_PARAM_REF_CPU_CYCLES constant
  
• Add virStorageVolGetInfoFlags & associated constants
  
• Add domain metdata change event
  
• Add secret event APIs