python/cpu_model: strip spaces from the CPU brand string
python/cpu_model: strip spaces from the CPU brand string

On some x86 CPUs, the brand string starts with spaces. This triggers the
following warning:

    [WARNING] /proc/cpuinfo and cpuid disagree:
    X86CPUInfo('GenuineIntel', 'Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz', 0x306a9, 0xc)
    vs
    X86CPUInfo('GenuineIntel', '       Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz', 0x306a9, None)

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