Add "vnc" option group for sample nova.conf file
Add "vnc" option group for sample nova.conf file

There is no "[vnc]" section in nova.conf.sample generated by
command "tox -egenconfig".
In addition, the "[default]" section has vnc options.

This patch moves vnc options from "[default]" section to
"[vnc]" section.

Change-Id: I5cf69729aa9e2bb868f26b82eaaa28187ce7a7a3
Closes-Bug: #1506356

BeyondTheClouds/nova,cyx1231st/nova,BeyondTheClouds/nova,zhimin711/nova,rahulunair/nova,Juniper/nova,Juniper/nova,NeCTAR-RC/nova,mikalstill/nova,alaski/nova,vmturbo/nova,cloudbase/nova,mahak/nova,vmturbo/nova,gooddata/openstack-nova,phenoxim/nova,mikalstill/nova,jianghuaw/nova,openstack/nova,mahak/nova,klmitch/nova,rajalokan/nova,hanlind/nova,cloudbase/nova,cernops/nova,cernops/nova,cloudbase/nova,dims/nova,Juniper/nova,sebrandon1/nova,BeyondTheClouds/nova,rahulunair/nova,rahulunair/nova,mahak/nova,klmitch/nova,gooddata/openstack-nova,rajalokan/nova,gooddata/openstack-nova,sebrandon1/nova,hanlind/nova,openstack/nova,zhimin711/nova,NeCTAR-RC/nova,CEG-FYP-OpenStack/scheduler,Juniper/nova,gooddata/openstack-nova,bigswitch/nova,rajalokan/nova,CEG-FYP-OpenStack/scheduler,hanlind/nova,cyx1231st/nova,phenoxim/nova,mikalstill/nova,sebrandon1/nova,openstack/nova,dims/nova,jianghuaw/nova,jianghuaw/nova,cernops/nova,klmitch/nova,vmturbo/nova,alaski/nova,jianghuaw/nova,bigswitch/nova,vmturbo/nova,klmitch/nova,rajalokan/nova