KVM: perf: a smart tool to analyse kvm events

Changlog:

- calculate stddev.
- make it works both for old kernel and new kernel.
- dynamically inquire max vcpus and cpu isa.

This is a example result of vmexit:

# ./perf kvm-events report
  Warning: Error: expected type 5 but read 4
  Warning: Error: expected type 5 but read 0
  Warning: unknown op '}'


Analyze events for all VCPUs:

             VM-EXIT    Samples  Samples%     Time%         Avg time

         APIC_ACCESS     152367    34.07%     1.74%     15.69us ( +-   2.02% )
      IO_INSTRUCTION     142663    31.90%     1.76%     16.91us ( +-   2.87% )
                 HLT      46681    10.44%    95.87%   2816.04us ( +-   2.94% )
       EPT_VIOLATION      40184     8.98%     0.15%      5.17us ( +-   1.26% )
               CPUID      21284     4.76%     0.04%      2.47us ( +-   0.66% )
  EXTERNAL_INTERRUPT      21215     4.74%     0.36%     23.39us ( +-   2.83% )
       EXCEPTION_NMI      11723     2.62%     0.04%      5.21us ( +-   2.46% )
           CR_ACCESS       5810     1.30%     0.02%      5.06us ( +-   1.01% )
   PENDING_INTERRUPT       5322     1.19%     0.01%      3.69us ( +-   1.73% )

Total Samples:447249, Total events handled time:137125528.85us.

Any comments are welcome! :)
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