Description of problem:
I deleted luns from my iSCSI target and created new ones. The problem is that in the UI, the former luns continue to be shown and the new ones does not appear.

Version-Release number of selected component (if applicable):
It's on version 0.95 (built from sources using instructions on the ovirt website)

How reproducible:
Everytime

Steps to Reproduce:
1. create 2 luns in an iSCSI target
2. add the target as storage host in the UI
3. delete the 2 luns and create 3 new ones of different size
4. refresh the volume list
  
Actual results:
the 2 first luns are still in the UI, the 3 new do not appear.

Expected results:
only see the 3 new ones.

Additional info:
- a refresh_pool message is well added to the taskomatic.log without any error messages.
- on the ovirt appliance accessing to the target in the console with iscsiadm gives the good result (3 new luns and not the 2 ancient ones)
- deleting the target on the filer, creating a new one with all the luns mapped to it and importing as storage pool in the UI works well
- filer is : openfiler 2.3, up to date, to manage iSCSI targets.