Enable connected ports, configure connectors and LLDP

[jbemmel]

The use of connectors varies between SR OS variants, it is convenient if vrnetlab configures them and enables the ports with LLDP

[hellt]

Hi @jbemmel
I would propose we make this an opt-out feature. There are use cases where users want to have a node with a +/- clean config, with ports not configured at all, as this might be the task they test/use.

So I think the easy opt-out way would be skip ports/breakout config if a certain env var is present. For example CLAB_CONFIG_SROS_PORTS=false.

[jbemmel]

Sure, we can add that