Install networking support on a dedicated compute node.

rpc_backend is changed for all distributions.

Change-Id: I46b71c9f76e56cde57c7916dae433391076d63bb
backport: havana
Closes-Bug: #1246840
(cherry picked from commit 09dcc4a91bf80f09ea36a04465d8b1de968e48e1)
Merge "Install networking support on a dedicated compute node." into stable/havana