Adds support for setting the number of CPUs per socket.
It requires the commit 9b9d2ebc1c6ec1007aba3e1c33daff7cac3c310b in the
`esx` gem:
https://github.com/tommyblue/esx/commit/9b9d2ebc1c6ec1007aba3e1c33daff7cac3c310b