Description of problem:

importing a vm with snapshots with "import more than once" will import the snapshots as disks instead of collapsing snapshots. 

Version-Release number of selected component (if applicable):

si4

How reproducible:

100%

Steps to Reproduce:
1. export a vm with snapshots
2. import the vm as 'import more than once'
3.
  
Actual results:

we are suppose to collaps the snapshots but we create the snapshots as additional disks. 

Expected results:

we should collaps snapshots

Additional info: both vdsm and backend logs attached


Thread-341::WARNING::2012-06-07 18:48:34,976::blockVolume::99::Storage.Volume::(getVSize) Could not get size for vol 14a1733b-45a0-49b9-ab46-c64230585b54/b0043295-8c73-4252-9ed0-6715536e38ed using optimized methods
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/blockVolume.py", line 92, in getVSize
    return _getDeviceSize(lvm.lvPath(sdobj.sdUUID, volUUID)) / bs
  File "/usr/share/vdsm/storage/blockVolume.py", line 63, in _getDeviceSize
    with open(devPath, "rb") as f:
IOError: [Errno 2] No such file or directory: '/dev/14a1733b-45a0-49b9-ab46-c64230585b54/b0043295-8c73-4252-9ed0-6715536e38ed'
Thread-341::WARNING::2012-06-07 18:48:34,990::blockVolume::99::Storage.Volume::(getVSize) Could not get size for vol 14a1733b-45a0-49b9-ab46-c64230585b54/b0043295-8c73-4252-9ed0-6715536e38ed using optimized methods
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/blockVolume.py", line 92, in getVSize
    return _getDeviceSize(lvm.lvPath(sdobj.sdUUID, volUUID)) / bs
  File "/usr/share/vdsm/storage/blockVolume.py", line 63, in _getDeviceSize
    with open(devPath, "rb") as f:
IOError: [Errno 2] No such file or directory: '/dev/14a1733b-45a0-49b9-ab46-c64230585b54/b0043295-8c73-4252-9ed0-6715536e38ed'
Thread-341::DEBUG::2012-06-07 18:48:34,991::__init__::1164::Storage.Misc.excCmd::(_log) '/bin/dd iflag=direct skip=35 bs=512 if=/dev/14a1733b-45a0-49b9-ab46-c64230585b54/metadata count=1' (cwd None)