network interface parameter and jvm memory fraction at k8s

[ahmet-uyar]

Following parameter added to specify network interfaces to be used by twister2 workers when there are multiple network interfaces in machines: twister2.network.interfaces.for.workers

Currently, it is only implemented in standalone. I think It is not needed for kubernetes. We can easily implement it if needed.

Another parameter added to specify jvm memory fraction in Kubernetes. By default, it is set to 0.8. Non-jvm memory usages include:

• memory based disk
• OpenMPI memory use
• UCX memory use

I also made checking password free ssh optional.