machines: fix preparation of disk data for disks of type volume
machines: fix preparation of disk data for disks of type volume

When filtering storage pools by name to match a pool that a disk resides
on we need to take into consideration the connection as well, because there
can be pools with same name on system and session connection.

https://bugzilla.redhat.com/show_bug.cgi?id=1661897
Closes #10874
andreasn/cockpit,mvollmer/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpituous/cockpit,cockpituous/cockpit,cockpituous/cockpit,deryni/cockpit,andreasn/cockpit,deryni/cockpit,moraleslazaro/cockpit,andreasn/cockpit,mvollmer/cockpit,cockpit-project/cockpit,deryni/cockpit,moraleslazaro/cockpit,andreasn/cockpit,garrett/cockpit,deryni/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,andreasn/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,garrett/cockpit,martinpitt/cockpit,martinpitt/cockpit,garrett/cockpit,cockpituous/cockpit,andreasn/cockpit,cockpit-project/cockpit,garrett/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,deryni/cockpit,cockpit-project/cockpit,garrett/cockpit,deryni/cockpit,andreasn/cockpit,cockpit-project/cockpit,mvollmer/cockpit,mvollmer/cockpit,deryni/cockpit