Description of problem:
Bug 863105 introduces a regression by loading the slaves configuration from the engine and dismissing the configuration provided by the user, notably using the SDK.

For example:

Origin configuration:
eth0 --- ovirtmgmt
eth1 --- net1
eth2 

New configuration:
eth00 --- ovirtmgmt
eth1 --|
       |---bond0 --- net1
eth2 --|

The flat interface list sent to setupNetwork by rest-api contains the 'net1' network attached both to 'et1' and to 'bond0'.

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


How reproducible:
always

Steps to Reproduce:
1. From setupNetworks dialog attach network 'net1' to eth1
2. Save network configuration (using setupNetworks)
3. Using ovirt-engine-sdk-python send setupNetworks command to configure eth1 bonded with eth2 into bond0 and attach 'net1' to it.
  
Actual results:
The command fails with error of network 'net1' is being attached to more than one interface.

Expected results:
Bond should be created with the network attached to it.

Additional info:
There are variety of errors that can be created due to the failure, i.e.
cannot reuse IP that was defined for a network (if configure using static boot protocol).