[CPDEV-95906] IPIP Encapsulation check

[alexarefev]

Description

• Calico IPIP traffic encapsulation needs to be covered by check_iaas
• The check should work on running cluster and clean nodes as well

Solution

• Add check for IP in IP overlay into check_iaas procedure
• Create additional code that implements IPIP packet sending and receiving
• Change CI process to build additional binary
• Update Installation and Kubecheck guides

Test Cases

TestCase 1
New check is working on clean nodes

Test Configuration:

• Hardware: 4CPU/8GB
• OS: Ubuntu 22.04; CentOS 7; RHEL 8; Rocky Linux 8; Oracle Linux 7
• Inventory: miniHA

Steps:

1. Create a set of clean nodes
2. Set plugins.calico.mode=ipip in cluster.yaml
3. Run check_iaas procedure with --task='network.ipip_connectivity'

Results:

Before	After
Not Applicable	IP in IP is checked

TestCase 2
Exemptions in network.ipip_connectivity check are working

Test Configuration:

• Hardware: 4CPU/8GB
• OS: Ubuntu 22.04
• Inventory: miniHA

Steps:

1. Set plugins.calico.install=false in cluster.yaml
2. Run check_iass procedure with --task='network.ipip_connectivity'
3. Set plugins.calico.mode=vxlan in cluster.yaml
4. Run check_iass procedure with --task='network.ipip_connectivity'
5. Set IPv6 network for services.kubeadm.networking.podSubnet in cluster.yaml
6. Run check_iass procedure with --task='network.ipip_connectivity'

Results:

Before	After
Not Applicable	check is skipped due to Calico is not set as CNI
Not Applicable	check is skipped due to encapsulation is not set to ipip
Not Applicable	check is skipped due to IP in IP encapsulation supports only IPv4 addresses

TestCase 3
The check is working on running cluster

Test Configuration:

• Hardware: 4CPU/8GB
• OS: Ubuntu 22.04
• Inventory: fullHA

Steps:

1. Run check_iass procedure with --task='network.ipip_connectivity' on running cluster. Calico must be running in ipip mode

Results:

Before	After
Not Applicable	Success

Checklist

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• Integration CI passed
• There is no merge conflicts