Kubevirt e2e stabilizing refactor

[qinqon]

- What this PR does and why is it needed
The kubevirt e2e tests are flaky, sometimes the persistent connection between tests and VM get broken and others the curl to ovn.org to check north soutgh traffic fail.

To fix those the following changes are introduced:

• Replace agnhost http server with a simple tcp server and configure tcp client with keepalive
• Replace systemd-resolved at the VM
• Replace ovn.org with kubernetes.default.svc.cluster.local to verify north/south traffic without external domain dependency.

Closes #3986

- Special notes for reviewers
This PR has being tested with 12 jobs in parallel run two time at author's fork
https://github.com/qinqon/ovn-kubernetes/actions/runs/7830706778/job/21366399247?pr=10

- Description for the changelog
Stabilize kubeirt e2e tests

[coveralls]

Changes unknown
when pulling a7aa34d on qinqon:kubevirt-e2e-stabilizing-refactor
into ** on ovn-org:master**.

[qinqon]

/hold
Is at better state but it has fail again, I will debug it.

[qinqon]

We don't have "reset by peer" error at server this time and we see that the connection is at the server

Failing at

after live migration for the second time to node not owning subnet: Check connectivity is restored after delete deny all network policy

2024-02-09T07:20:48.1190075Z   �[38;5;9m[FAILED] worker1: after live migration for the second time to node not owning subnet: Check connectivity is restored after delete deny all network policy
2024-02-09T07:20:48.1191653Z   Expected success, but got an error:
2024-02-09T07:20:48.1192369Z       <*fmt.wrapError | 0xc000763d20>: 
2024-02-09T07:20:48.1193746Z       failed Write to server: write tcp 172.18.0.1:41446->172.18.0.3:31702: write: broken pipe
2024-02-09T07:20:48.1194723Z       {
2024-02-09T07:20:48.1196036Z           msg: "failed Write to server: write tcp 172.18.0.1:41446->172.18.0.3:31702: write: broken pipe",
2024-02-09T07:20:48.1197218Z           err: <*net.OpError | 0xc00123f9f0>{
2024-02-09T07:20:48.1197908Z               Op: "write",
2024-02-09T07:20:48.1198471Z               Net: "tcp",
2024-02-09T07:20:48.1199748Z               Source: <*net.TCPAddr | 0xc0006ed9b0>{IP: [172, 18, 0, 1], Port: 41446, Zone: ""},
2024-02-09T07:20:48.1201354Z               Addr: <*net.TCPAddr | 0xc0006edaa0>{IP: [172, 18, 0, 3], Port: 31702, Zone: ""},
2024-02-09T07:20:48.1202601Z               Err: <*os.SyscallError | 0xc000763d00>{
2024-02-09T07:20:48.1203335Z                   Syscall: "write",
2024-02-09T07:20:48.1203895Z                   Err: <syscall.Errno>0x20,
2024-02-09T07:20:48.1204307Z               },
2024-02-09T07:20:48.1204642Z           },
2024-02-09T07:20:48.1204937Z       }�[0m
2024-02-09T07:20:48.1206276Z   �[38;5;9mIn �[1m[It]�[0m�[38;5;9m at: �[1m/home/runner/work/ovn-kubernetes/ovn-kubernetes/test/e2e/kubevirt.go:401�[0m �[38;5;243m@ 02/09/24 07:20:46.845�[0m

2024-02-09T07:17:45.5892685Z 2024/02/09 07:16:01 Handling connection 100.64.0.3:37592
2024-02-09T07:17:45.5894256Z 2024/02/09 07:16:02 Handling connection [fd98::3]:46496