Debugging performance issues often includes comparison of brick strace files to
compare number of syscalls/maximum-latencies per syscall etc with previous runs.
    This script helps in getting these numbers.
    Running it creates 3 types of files:
    1) syscalls-summary.txt - Prints per syscall counts
    2) <syscall>-latency.txt - This is an intermediate file where all 'syscall'
    calls from all the strace files will be listed.
    3) per-fop-latency.txt - Per syscall it prints top <n> maximum latencies
    observed.
    
    Assumes the files in strace-dir are created using the following command:
    $ strace -ff -T -p <pid-of-brick> -o <path-to-the-dir/file-where-output-is-saved>
    
    Sample output of syscalls-summary.txt:
      49857 chmod
      49906 chown
      97542 close
     650309 fgetxattr
         18 flistxattr
    ....
    
    Sample output of per-fop-latency.txt:
    --chmod--
    0.000216
    0.000254
    0.000266
    ...
    --unlink--
    0.020208
    0.025084
    0.027231
    ...


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