Description of problem:
When importing storage as ISO/NFS and action fails connection is still stored in database in table storage_server_connections

Version-Release number of selected component (if applicable):
is18

How reproducible:
100%

Steps to Reproduce:
1. Create Export NFS storage a
2. Detach and remove from engine storage a 
3. Import storage a as ISO/NFS storage
4. Action fails however it is still stored in storage_server_connections table

Actual results:
Conenction added to storage_server_connections table with type 1

Expected results:
Fail to add storage when engine fails to add storage (in database too :)

Additional info:
Can provide other than engine.log (see bellow) if necessary (hopefully not)
engine.log of the action:

2013-10-11 16:22:35,899 INFO  [org.ovirt.engine.core.bll.storage.AddStorageServerConnectionCommand] (ajp-/127.0.0.1:8702-6) Running command: AddStorageServerConnectionCommand internal: false. Entities affected :  ID: aaa00000-0000-0000-0000-123456789aaa Type: System
2013-10-11 16:22:35,900 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.ConnectStorageServerVDSCommand] (ajp-/127.0.0.1:8702-6) START, ConnectStorageServerVDSCommand(HostName = 10.34.62.204, HostId = fb9c2e50-bc05-4cce-b584-192c49f26b27, storagePoolId = 00000000-0000-0000-0000-000000000000, storageType = NFS, connectionList = [{ id: null, connection: 10.34.63.202:/mnt/export/nfs/lv3/lsvaty/nfs01, iqn: null, vfsType: null, mountOptions: null, nfsVersion: null, nfsRetrans: null, nfsTimeo: null };]), log id: 1a4a5406
2013-10-11 16:22:36,283 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.ConnectStorageServerVDSCommand] (ajp-/127.0.0.1:8702-6) FINISH, ConnectStorageServerVDSCommand, return: {00000000-0000-0000-0000-000000000000=0}, log id: 1a4a5406
2013-10-11 16:22:36,427 INFO  [org.ovirt.engine.core.bll.storage.AddStorageServerConnectionCommand] (ajp-/127.0.0.1:8702-6) Lock freed to object EngineLock [exclusiveLocks= key: 10.34.63.202:/mnt/export/nfs/lv3/lsvaty/nfs01 value: STORAGE_CONNECTION
, sharedLocks= ]
2013-10-11 16:22:36,444 INFO  [org.ovirt.engine.core.bll.storage.GetExistingStorageDomainListQuery] (ajp-/127.0.0.1:8702-10) START, GetExistingStorageDomainListQuery(refresh: true, filtered: false), log id: 4b916061
2013-10-11 16:22:36,446 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.HSMGetStorageDomainsListVDSCommand] (ajp-/127.0.0.1:8702-10) START, HSMGetStorageDomainsListVDSCommand(HostName = 10.34.62.204, HostId = fb9c2e50-bc05-4cce-b584-192c49f26b27, storagePoolId=00000000-0000-0000-0000-000000000000, storageType=NFS, storageDomainType=ISO, path=10.34.63.202:/mnt/export/nfs/lv3/lsvaty/nfs01), log id: 3eb85b36
2013-10-11 16:22:39,654 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.HSMGetStorageDomainsListVDSCommand] (ajp-/127.0.0.1:8702-10) FINISH, HSMGetStorageDomainsListVDSCommand, return: [], log id: 3eb85b36
2013-10-11 16:22:39,654 INFO  [org.ovirt.engine.core.bll.storage.GetExistingStorageDomainListQuery] (ajp-/127.0.0.1:8702-10) FINISH, GetExistingStorageDomainListQuery, log id: 4b916061
2013-10-11 16:22:39,827 INFO  [org.ovirt.engine.core.bll.storage.DisconnectStorageServerConnectionCommand] (ajp-/127.0.0.1:8702-13) Running command: DisconnectStorageServerConnectionCommand internal: false. Entities affected :  ID: aaa00000-0000-0000-0000-123456789aaa Type: System
2013-10-11 16:22:39,829 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.DisconnectStorageServerVDSCommand] (ajp-/127.0.0.1:8702-13) START, DisconnectStorageServerVDSCommand(HostName = 10.34.62.204, HostId = fb9c2e50-bc05-4cce-b584-192c49f26b27, storagePoolId = 00000000-0000-0000-0000-000000000000, storageType = NFS, connectionList = [{ id: null, connection: 10.34.63.202:/mnt/export/nfs/lv3/lsvaty/nfs01, iqn: null, vfsType: null, mountOptions: null, nfsVersion: null, nfsRetrans: null, nfsTimeo: null };]), log id: 5bf67675
2013-10-11 16:22:41,968 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.DisconnectStorageServerVDSCommand] (ajp-/127.0.0.1:8702-13) FINISH, DisconnectStorageServerVDSCommand, return: {00000000-0000-0000-0000-000000000000=0}, log id: 5bf67675
2013-10-11 16:27:35,371 INFO  [org.ovirt.engine.core.vdsbroker.irsbroker.IrsBrokerCommand] (pool-5-thread-46) starting ProcessDomainRecovery for domain ca414eb9-98ab-422f-8c4e-c2c513231058:str-01-jbelka-export
2013-10-11 16:27:35,426 WARN  [org.ovirt.engine.core.vdsbroker.irsbroker.IrsBrokerCommand] (pool-5-thread-46) Storage domain ca414eb9-98ab-422f-8c4e-c2c513231058:str-01-jbelka-export is not visible to one or more hosts. Since the domains type is ImportExport, hosts status will not be changed to non-operational
2013-10-11 16:27:44,794 WARN  [org.ovirt.engine.core.vdsbroker.irsbroker.IrsBrokerCommand] (pool-5-thread-46) domain ca414eb9-98ab-422f-8c4e-c2c513231058:str-01-jbelka-export in problem. vds: 10.34.62.204