Description of problem:
Attempt to force-remove a data center which contains VMs that are using vnic profiles fails.

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


How reproducible:
always

Steps to Reproduce:
1. Create a DC (add cluster, storage, host)
2. Add a vm with vnic that uses a profile.
3. Try to force remove the data center

Actual results:
Action fails with 5001 error.

Expected results:
DC should be removed.

Additional info:
The network elements are being removed prior to the vm removal therefore referenced vnic profiles caused this operation to fail:

b28b6eb1-680b-4e01-9c6d-95532411be18 Type: StoragePool
2013-08-14 10:25:20,222 INFO  [org.ovirt.engine.core.utils.transaction.TransactionSupport] (http--0.0.0.0-8080-2) transaction rolled back
2013-08-14 10:25:20,223 ERROR [org.ovirt.engine.core.bll.storage.RemoveStoragePoolCommand] (http--0.0.0.0-8080-2) Command org.ovirt.engine.core.bll.storage.RemoveStoragePoolCommand throw exception: org.springframework.dao.DataIntegrityViolationException: CallableStatementCallback; SQL [{call deletevnicprofile(?)}]; ERROR: update or delete on table "vnic_profiles" violates foreign key constraint "fk_vm_interface_vnic_profile_id" on table "vm_interface"
  Detail: Key (id)=(0000000f-000f-000f-000f-00000000000f) is still referenced from table "vm_interface".
  Where: SQL statement "DELETE FROM vnic_profiles WHERE id =  $1 "
PL/pgSQL function "deletevnicprofile" line 5 at SQL statement; nested exception is org.postgresql.util.PSQLException: ERROR: update or delete on table "vnic_profiles" violates foreign key constraint "fk_vm_interface_vnic_profile_id" on table "vm_interface"
  Detail: Key (id)=(0000000f-000f-000f-000f-00000000000f) is still referenced from table "vm_interface".
  Where: SQL statement "DELETE FROM vnic_profiles WHERE id =  $1 "
PL/pgSQL function "deletevnicprofile" line 5 at SQL statement
        at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:245) [spring-jdbc.jar:3.1.1.RELEASE]