There is no cpuacct.usage_all file in CentOS 7

There is no cpuacct.usage_all file in CentOS 7. Reading of cpuacct.usage_all was introduced in #2271. 
Issue observed on:
Operating System: CentOS Linux 7 (Core)
Kernel: Linux 3.10.0-1062.18.1.el7.x86_64

I provide a fix for this issue in next week.
