[calico] don't enable ipip encapsulation by default and use vxlan in CI (#8434)

* [calico] make vxlan encapsulation the default

* don't enable ipip encapsulation by default
* set calico_network_backend by default to vxlan
* update sample inventory and documentation

* [CI] pin default calico parameters for upgrade tests to ensure proper upgrade

* [CI] improve netchecker connectivity testing

* [CI] show logs for tests

* [calico] tweak task name

* [CI] Don't run the provisioner from vagrant since we run it in testcases_run.sh

* [CI] move kube-router tests to vagrant to avoid network connectivity issues during netchecker check

* service proxy mode still fails connectivity tests so keeping it manual mode

* [kube-router] account for containerd use-case

roles/network_plugin/kube-router/templates/kube-router.yml.j2

@@ -62,6 +62,14 @@ spec:
         - --metrics-path={{ kube_router_metrics_path }}
         - --metrics-port={{ kube_router_metrics_port }}
 {% endif %}
+{% if kube_router_enable_dsr %}
+{% if container_manager == "docker" %}
+        - --runtime-endpoint=unix:///var/run/docker.sock
+{% endif %}
+{% if container_manager == "containerd" %}
+{% endif %}
+        - --runtime-endpoint=unix:///run/containerd/containerd.sock
+{% endif %}
 {% for arg in kube_router_extra_args %}
         - "{{ arg }}"
 {% endfor %}
@@ -86,9 +94,16 @@ spec:
           privileged: true
         volumeMounts:
 {% if kube_router_enable_dsr %}
+{% if container_manager == "docker" %}
         - name: docker-socket
           mountPath: /var/run/docker.sock
           readOnly: true
+{% endif %}
+{% if container_manager == "containerd" %}
+        - name: containerd-socket
+          mountPath: /run/containerd/containerd.sock
+          readOnly: true
+{% endif %}
 {% endif %}
         - name: lib-modules
           mountPath: /lib/modules
@@ -118,10 +133,18 @@ spec:
       - operator: Exists
       volumes:
 {% if kube_router_enable_dsr %}
+{% if container_manager == "docker" %}
       - name: docker-socket
         hostPath:
           path: /var/run/docker.sock
           type: Socket
+{% endif %}
+{% if container_manager == "containerd" %}
+      - name: containerd-socket
+        hostPath:
+          path: /run/containerd/containerd.sock
+          type: Socket
+{% endif %}
 {% endif %}
       - name: lib-modules
         hostPath: