You can do that by:
vim /etc/neutron/dhcp_agent.ini
change use_namespaces = False
The full configuration to restart it is :
Stop all network services:
/etc/init.d/neutron-dhcp-agent stop
/etc/init.d/neutron-linuxbridge-agent stop
pkill -9 dnsmasq
/etc/init.d/neutron-l3-agent stop
brctl show
bridge name bridge id STP enabled interfaces
brq0d2c0758-9e 8000.0002c9190221 no eth2.2
tap63eebc59-5d
tap6d982591-ed
ip link delete tap6d982591-ed # delete all the interfaces
vim /etc/neutron/dhcp_agent.ini
change use_namespaces = False
for in in ‘ls /etc/init.d/neutron*` ; do $i restart ; done
ip a # verify that ns-* created