Add support for regular SSH
Description
We need to add support for sites utilizing regular SSH (passoword or keypair protected) in addition to current GSISSH support via Rimrock API. Such computation should be available for Rimrock and Singularity step and be fully compatible with said GSISSH version. It is also important for demo VM set including containerized SLURM.
Proposal
Computations will be extended to enable selection/configuration of the host and utilization of proper mechanism (SSH or GSISSH) and credentials.