Fix file exists bug when creating network in devstack.
Remove ip addresses before adding an ip address to dev.
Closes-Bug:
@@ -388,6 +388,7 @@ function tacker_create_initial_network {
echo "Assign ip address to BR_MGMT"
sudo ip link set ${BR_MGMT} up
+ sudo ip -4 address flush dev ${BR_MGMT}
sudo ip address add ${NETWORK_GATEWAY_MGMT_IP} dev ${BR_MGMT}
}
