Remove network settings logging from 'info' channel

When we create a cluster with nova-network then FlatDHCP selected
by default. Latelly the network configuration can be updated but
'info' log provides inaccurate information.

This logging is redundant because all necessary information is
logged with @logwrap

Change-Id: Ib409176a4ebfb9e1ab18215ec8cfaf6a8d478e9e
Closes-Bug: #1398071