[libvirt] Deleting the base image needed by a snapshot causes libvirtd to die

[Nick Moffitt]

In my testing, I got the order of my images wrong, and tried to delete
a base image that I had snapshotted:

Feb 13 15:28:33 gnusto libvirtd: 15:28:33.800: error : internal error
	'/sbin/lvremove -f /dev/VMs/base' exited with non-zero status 5
	and signal 0:   Can't remove logical volume "base" under snapshot  
Feb 13 15:28:37 gnusto kernel: [683740.164008] libvirtd[10397] general
	protection rip:7fd6c91a1ae0 rsp:7fd6c62b2d88 error:0

Obviously the first error is 100% correct.

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