Docker-py: Add support for --cpus run flag

[ko-christ]

In Docker 1.13 or higher --cpus is the suggested option to configure CPU quota.
Option doesn't seem to be supported at the moment.
https://docker-py.readthedocs.io/en/stable/containers.html

Any chance we could add support for the --cpus run flag?

[shin-]

It's called nano_cpus in the API

[n-a-sz]

It is not in the docs.... https://github.com/docker/docker-py/blob/master/docker/api/container.py#L512-L513

[n-a-sz]

For future reference, you have to provide the number of CPUs multiplied by 10^9
e.g. nano_cpus=2000000000 for 2 CPUs