test: Add ability to specify more storage in vm-run
test: Add ability to specify more storage in vm-run

This adds a --storage option to vm-run. Where an additional
disk device becomes available pointing to the desired file.
This allows playing around with larger storages during development
using the vm-run tool.

Closes #10331

cockpituous/cockpit,deryni/cockpit,cockpit-project/cockpit,andreasn/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,andreasn/cockpit,mvollmer/cockpit,andreasn/cockpit,cockpituous/cockpit,deryni/cockpit,deryni/cockpit,martinpitt/cockpit,andreasn/cockpit,mvollmer/cockpit,cockpituous/cockpit,deryni/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,cockpituous/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,andreasn/cockpit,garrett/cockpit,moraleslazaro/cockpit,deryni/cockpit,cockpit-project/cockpit,andreasn/cockpit,deryni/cockpit,garrett/cockpit,deryni/cockpit,mvollmer/cockpit,andreasn/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,mvollmer/cockpit,garrett/cockpit,martinpitt/cockpit,cockpituous/cockpit,cockpituous/cockpit,cockpit-project/cockpit,garrett/cockpit,garrett/cockpit