Update offloading modes for fake nodes
Update offloading modes for fake nodes

It's impossible to test offloading modes with Web UI functional tests.
Nailgun fixtures contains sample of nodes with offloading modes.
However, they is not updated while loading.

Change-Id: Idd3bdf08dfae109c4a7973d83e939e590a1ef8db
Closes-Bug: #1598182

stackforge/fuel-web,stackforge/fuel-web,stackforge/fuel-web