[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/kubernetes/preinstall/tasks/0020-verify-settings.yml

@@ -36,6 +36,24 @@
     - kube_network_plugin is defined
     - not ignore_assert_errors
 
+- name: Stop if legacy encapsulation variables are detected (ipip)
+  assert:
+    that:
+      - ipip is not defined
+    msg: "'ipip' configuration variable is deprecated, please configure your inventory with 'calico_ipip_mode' set to 'Always' or 'CrossSubnet' according to your specific needs"
+  when:
+    - kube_network_plugin == 'calico'
+    - not ignore_assert_errors
+
+- name: Stop if legacy encapsulation variables are detected (ipip_mode)
+  assert:
+    that:
+      - ipip_mode is not defined
+    msg: "'ipip_mode' configuration variable is deprecated, please configure your inventory with 'calico_ipip_mode' set to 'Always' or 'CrossSubnet' according to your specific needs"
+  when:
+    - kube_network_plugin == 'calico'
+    - not ignore_assert_errors
+
 - name: Stop if incompatible network plugin and cloudprovider
   assert:
     that: