Support host config cpus

## Description

Support host config ```--cpus=<value>```

I know we have workaround, but it will be good to have --cpus.

> set ```--cpus="1.5"```, the container will be guaranteed to be able to access at most one and a half of the CPUs. This is the equivalent of setting ```--cpu-period="100000"``` and ```--cpu-quota="150000"```. Available in Docker 1.13 and higher.


  