mlos_bench: examples/abstractions for modeling reconfig vs. restart and reprovision

[bpkroth]

Some system parameters require reloading data or restarting to take effect. We should make sure that we have examples at least or new abstractions for those.

[bpkroth]

Another related thing:

• reallocate vs. deprovision
  This is especially important for VMs as dellocation (without deleting the original resources), is slightly more expensive than a reboot, since it involves removing the VM from a node and rescheduling it (possibly/hopefully elsewhere) in the cloud system (Azure), which can be important for conducting repeat evaluations of a config across space and time for determining config robustness to different sources of noise.