fix agent funcs calculate meminfo problem #662
Merged
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修正在centos等版本下对内存计算存在较大偏差的问题:
1、第三方库在计算memfree时未考虑由于版本问题MemAvailable字段是否会计算,例如在centos6.3内存字段中就没有MemAvailable,而在cent0s7以上版本为了更好的衡量进程间通信,加入了MemAvailable字段
2、该修改在centos、ubuntu等测试均与实际值一致