Adding information on storage IP connections

Adding information on the option to configure a storage node IP
to connect with, and send images to, the compute nodes when
the storage node is located on a separate network.

Change-Id: I85aa5f46de70b2cfa856ce3048c7632588c9426a
Backport: none
Closes-Bug: #1398034
Merge "Adding information on storage IP connections"