Changed network interface configuration to use more generic naming
which improves compatibility with more distributions. For example,
RHEL 7 uses "ens#" rather than "eth#" for interface names. These
changes also required updating various diagrams. This patch also
removes redundant configuration instructions from the "Configure a
compute node" section covered by architecture and basic environment
configuration sections.
Change-Id: Ia3c895d938c341398a9544f5eb10bb7346a29a06
Closes-Bug: #1312273
fb88526110
