sctp reproducer with OVN

sctp_ovn_steps

1. Pull https://github.com/trozet/ovn-kubernetes/tree/fix_delete_sctp_ct
2. ./kind.sh -wk 1
3. Create ovn networked pod:
[trozet@fedora ovn-kubernetes]$ cat ~/basic.yaml 
---
apiVersion: v1
kind: Pod
metadata:
  name: trozet3
  labels:
    pod-name: client
    role: webserver
    app: spk-coredns  
spec:
  #hostNetwork: true
  containers:
  - name: pod1
    image: docker.io/centos/tools:latest
    command:
      #      - /usr/bin/echo
      - /sbin/init
    imagePullPolicy: IfNotPresent
    
4. Create host networked pod:
[trozet@fedora ovn-kubernetes]$ cat ~/basic2.yaml 
---
apiVersion: v1
kind: Pod
metadata:
  name: pod2
  labels:
    pod-name: server2
spec:
  hostNetwork: true
  containers:
  - name: pod2
    image: docker.io/centos/tools:latest
    command:
      - /sbin/init

5. Create SCTP service:
[trozet@fedora ovn-kubernetes]$ cat ~/sctp_service.yaml 
apiVersion: v1
kind: Service
metadata:
  name: my-service
spec:
  selector:
    #role: sctpserver
    pod-name: client
  ports:
    - protocol: SCTP
      port: 30102
      targetPort: 30102
  externalIPs:
    - 172.31.249.11

6. Start sctp server in ovn networked pod:
kubectl exec -it trozet3 /bin/bash
nc -l 30102 --sctp

7. Start sctp client in host networked pod:
kubectl exec -it pod2 /bin/bash
nc -v 172.31.249.11 30102 --sctp

8. Send some data from host networked pod, verified received in ovn networked pod. Also sctp heart beats should be being sent.

9. Start tcpdump in the ovnkube-node watching breth0 for port 30102:
kubectl exec -n ovn-kubernetes -it ovs-node-xlqsm /bin/bash
tcpdump -i breth0 -nneev port 30102

10. Start tcpdump in the ovn networked pod:
kubectl exec -it trozet3 /bin/bash
tcpdump -i eth0 sctp -eennv

11. Delete the service.

12. You will now see heartbeats only making it from the ovn networked pod -> host networked pod. 
Host networked pod will send heartbeat Req/Ack, and it will make it into breth0, but dropped somewhere in OVN.