Wireguard gateway failover tests fails in 0.18

[aswinsuryan]

What happened:Wireguard gateway failover tests fails in 0.18

What you expected to happen: The tests should pass

How to reproduce it (as minimally and precisely as possible): Run e2e in 0.18 branch, the logs are attached.

Anything else we need to know?:

Environment:

• Diagnose information (use subctl diagnose all):
• Gather information (use subctl gather):
• Cloud provider or hardware configuration:
• Install tools:
• Others:
  [
  submariner-gather.zip
  ](url)

[yboaron]

The root cause for this issue is wireguard submariner network interface created with new ifindex after GW pod restarted, meaning all host routes created in route agent pod with LinkIndex pointing to previous wireguard submariner ifindex are deleted.

To workaround this issue we can restart the route-agent pod on gateway node.