Support Cloud Linux

[vholer]

Add support for Cloud Linux contextualization.

Cloud Linux is a CentOS based distribution, so the existing CentOS package should more or less work with small or none changes. There is a public cloud image (https://docs.cloudlinux.com/cloudlinux_installation/#cloudlinux-os-images) which could be used for marketplace.

Please, place emoji on this initial comment in case you are interested in this feature. It allows us to track the level of interest. Thank you.

[y-sokoloff]

Hi, we'd like to see CloudLinux Images in OpenNebula.

We tried to make our own images but context for network in CL7-8 doesn't work.