kvm: Fixes #2868 libvirt resize notify failure (#2878)
kvm: Fixes #2868 libvirt resize notify failure (#2878)

Incorrect diskpath information was being sent to virsh blockresize, so the block device size was never refreshed to reflect the new disk size.
Fixes #2868
jcshen007/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,jcshen007/cloudstack,GabrielBrascher/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,jcshen007/cloudstack