Add note about negative feedback to 'effective neutron'
Add note about negative feedback to 'effective neutron'

Change-Id: I7808d23779c09f492eef5f024e19285820db57b0

sebrandon1/neutron,apporc/neutron,cloudbase/neutron,mahak/neutron,bigswitch/neutron,openstack/neutron,yanheven/neutron,jumpojoy/neutron,wolverineav/neutron,klmitch/neutron,eayunstack/neutron,bigswitch/neutron,igor-toga/local-snat,huntxu/neutron,apporc/neutron,huntxu/neutron,klmitch/neutron,mahak/neutron,asgard-lab/neutron,openstack/neutron,glove747/liberty-neutron,dims/neutron,mahak/neutron,eayunstack/neutron,wolverineav/neutron,chitr/neutron,sebrandon1/neutron,dims/neutron,chitr/neutron,noironetworks/neutron,glove747/liberty-neutron,MaximNevrov/neutron,asgard-lab/neutron,igor-toga/local-snat,yanheven/neutron,MaximNevrov/neutron,cloudbase/neutron,openstack/neutron,jumpojoy/neutron,noironetworks/neutron