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Description of problem:
libvirt can create disk snapshot with --disk-only 
but can not revert or delete it via virsh 
file this bug to trace this issue

Version-Release number of selected component (if applicable):
libvirt-0.10.2-7.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1.
# virsh snapshot-list bug
 Name                 Creation Time             State
------------------------------------------------------------
 ex_vm1               2012-11-06 13:51:15 +0800 running
 internal-s1          2012-11-06 14:10:26 +0800 running
 s2                   2012-11-06 13:45:25 +0800 disk-snapshot
 savevm1              2012-11-06 14:20:18 +0800 running

2.
# virsh snapshot-revert bug s2
error: unsupported configuration: revert to external disk snapshot not supported yet

3.
# virsh snapshot-delete bug s2
error: Failed to delete snapshot s2
error: unsupported configuration: deletion of 1 external disk snapshots not supported yet

  
Actual results:
as steps

Expected results:
can delete can revert disk snapshot

Additional info:
confirm with Peter Krempa in bug 873285 comments 5,6

External snapshots are a subset of external checkpoints to this will be taken care of when adding support for external checkpoints.

*** This bug has been marked as a duplicate of bug 873285 ***