Instance DHCP requests are not sent to dhcp servers

[Vasyl Saienko]

When attaching network to EVPN the DHCP stops working. The issue here that we redirect all traffic from 22 table into group:X and original neutron rules that passes traffic to DHCP server via other VXLAN tunnels doesn't work.

root@vs-ps-u3zxwtxhrljc-0-liyycceouln2-server-hnx2glcv5wn5:/# ovs-ofctl dump-flows br-tun --protocols=OpenFlow13 table=22
 cookie=0xba5eaef6ce8230ae, duration=15061.762s, table=22, n_packets=216, n_bytes=9072, priority=1,dl_vlan=1 actions=pop_vlan,set_field:0x3->tun_id,output:"vxlan-0a0f0025",output:"vxlan-0a0
f0055"
 cookie=0xba5eaef6ce8230ae, duration=15061.206s, table=22, n_packets=2, n_bytes=84, priority=1,dl_vlan=2 actions=pop_vlan,set_field:0x4->tun_id,output:"vxlan-0a0f0025",output:"vxlan-0a0f001
3"
 cookie=0x3fab1f5ed729d8d1, duration=15041.025s, table=22, n_packets=11, n_bytes=822, priority=5,dl_vlan=2 actions=group:2
 cookie=0xba5eaef6ce8230ae, duration=6167.083s, table=22, n_packets=59, n_bytes=11688, priority=1,dl_vlan=3 actions=pop_vlan,set_field:0x5->tun_id,output:"vxlan-0a0f0055",output:"vxlan-0a0f
0013"
 cookie=0x0, duration=67.415s, table=22, n_packets=1881, n_bytes=641146, priority=5,dl_vlan=1 actions=group:1
 cookie=0xba5eaef6ce8230ae, duration=15083.553s, table=22, n_packets=14, n_bytes=588, priority=0 actions=drop

root@vs-ps-u3zxwtxhrljc-0-liyycceouln2-server-hnx2glcv5wn5:/# ovs-ofctl dump-groups br-tun
NXST_GROUP_DESC reply (xid=0x2):
 group_id=2,type=all,bucket=bucket_id:0,actions=strip_vlan,load:0xc8->NXM_NX_TUN_ID[],output:"vxlan-0a0f0009"
 group_id=1,type=all,bucket=bucket_id:0,actions=strip_vlan,load:0x64->NXM_NX_TUN_ID[],output:"vxlan-0a0f0009"

[Lajos Katona (lajos-katona)]

Proposed fix: https://review.opendev.org/c/openstack/networking-bagpipe/+/775398

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Rodolfo Alonso <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/networking-bagpipe/+/775398
Reason: If needed, feel free to restore the patch and fix the merge conflict