Add Dell Enterprise Sonic-CLI driver

[dougszumski]

This patch is required urgently for Cambridge. It is unlikely
that we can wait for the upstream patch to merge:
https://review.opendev.org/c/openstack/networking-generic-switch/+/965373

This driver uses the sonic-cli rather than Linux userspace to
configure the switch. This is because LLDP advertises switch
ports based on the naming from the sonic-cli, which is not the
same as Linux userspace.

Note the existing Dell SONiC driver is using the Linux namespace
netmiko driver, which is not suitable.

[dougszumski]

pep8 fail is unrelated

[mnasiadka]

Is there a reason it doesn't support trunk?
Should we first merge it in 2025.1?

[dougszumski]

Is there a reason it doesn't support trunk? Should we first merge it in 2025.1?

Good questions. They don't want to configure trunk ports, they would just turn off that feature. I could add it if we have these switches somewhere else. I was hoping to backport the upstream patch if I can get it merged, but this could also go to 2025.1 first if you'd prefer.

[mnasiadka]

Is there a reason it doesn't support trunk? Should we first merge it in 2025.1?

Good questions. They don't want to configure trunk ports, they would just turn off that feature. I could add it if we have these switches somewhere else. I was hoping to backport the upstream patch if I can get it merged, but this could also go to 2025.1 first if you'd prefer.

Ok then - let's try to update the upstream patch with trunk (since trunking is normally supported since 2025.1) - and merge this one in 2024.1. If you need any help in adding the trunk commands or gaining traction from the Ironic community - please let me know :-)

[dougszumski]

After more investigation, I'm going to abandon this. It turns out that you can convert Linux userspace to use a different naming convention with: sudo config interface naming-mode standard-ext, then reboot the switch. We can then use the existing ngs_sonic driver, with some small tweaks.

It appears than sonic-cli is not that widely used, so Linux userspace is preferred. Dell also: recommends that you use the standard or standard extended interface-naming mode. It is odd that native mode is turn on by default.