Cluster change type 'interfaces' added

'Deploy Changed' dialog requires 'interfaces' changes for
properly information presentation. Interfaces change has similar
structure to disc change: {node_id=2, name="interfaces"}.

Change-Id: I43ea96e40d38e459c9d0cf68c0c944026b74da81
Closes-Bug: #1291854
Merge "Cluster change type 'interfaces' added"