[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/calico/templates/calico-node.yml.j2

@@ -176,7 +176,7 @@ spec:
             - name: WAIT_FOR_DATASTORE
               value: "true"
 {% endif %}
-{% if calico_network_backend is defined and calico_network_backend == 'vxlan' %}
+{% if calico_network_backend == 'vxlan' %}
             - name: FELIX_VXLANVNI
               value: "{{ calico_vxlan_vni }}"
             - name: FELIX_VXLANPORT
@@ -319,7 +319,7 @@ spec:
               command:
               - /bin/calico-node
               - -felix-live
-{% if calico_network_backend|default("bird") == "bird" %}
+{% if calico_network_backend == "bird" %}
               - -bird-live
 {% endif %}
             periodSeconds: 10
@@ -330,7 +330,7 @@ spec:
             exec:
               command:
               - /bin/calico-node
-{% if calico_network_backend|default("bird") == "bird" %}
+{% if calico_network_backend == "bird" %}
               - -bird-ready
 {% endif %}
               - -felix-ready