This will lead to quicker drop of the UE context in the gNB once it
disconnected from RFsim.

The physim tests fail because, typically, the same tests gets assigned
to the same node which then is overloaded. This MR assigns pods to
different nodes to prevent this.

- variable is_secondary_gnb is not used anywhere, so remove
- variable lowmem is not used/defines should be changed, so remove