fix proc_num monitor #77
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现在的情况
根据配置的cmd和cmdline 周期性扫描/proc下符合条件的进程, 当/proc下有符合条件的进程时，则proc_num数目大于0,反正则等于0.
问题
考虑这种情况,假如有一个程序存在缓慢的内存泄漏,持续很长时间后因OOM被干掉,被干掉后立马由supervisor等进程管理工具自动拉起,如果整个挂掉到被拉起的过程刚好在agent扫描/proc的周期中, 则从agent的视角来看认为此程序状态是正常的(实际上发生了异常重启),使得这种隐蔽问题被发现的周期大大延长.进程端口监控同样有这种问题.