Remove unnecessary calls
Remove unnecessary calls

* powering off nodes will not work since there are no networks attached.
IPMI network is controlled by HIL.

* Nodes can only be in the free pool if there are no networks attached. So
calling _remove_all_networks is useless.

mghpcc-projects/user_level_slurm_reservations,mghpcc-projects/user_level_slurm_reservations