The config options of the section
"nova/netconf" got moved to the
new central location
"nova/conf/netconf.py"
Change-Id: I8a17b6f00b15e03de55385fc0206bdc82441304a
Depends-On: I0da2ad7daa942b85c3395dc4861c6e18368ece88
Implements: blueprint centralize-config-options-newton