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: Ieef687b815e18ff22c7660e41863e1596c352b91
Closes-Bug: #1398071