Rename ansible groups to use _ instead of - (#7552)

* rename ansible groups to use _ instead of -

k8s-cluster -> k8s_cluster
k8s-node -> k8s_node
calico-rr -> calico_rr
no-floating -> no_floating

Note: kube-node,k8s-cluster groups in upgrade CI
      need clean-up after v2.16 is tagged

* ensure old groups are mapped to the new ones

legacy_groups.yml

@@ -0,0 +1,42 @@
+---
+# This is an inventory compatibility playbook to ensure we keep compatibility with old style group names
+
+- name: Add kube-master nodes to kube_control_plane
+  hosts: kube-master
+  gather_facts: false
+  tasks:
+    - name: add nodes to kube_control_plane group
+      group_by:
+        key: 'kube_control_plane'
+
+- name: Add kube-node nodes to kube_node
+  hosts: kube-node
+  gather_facts: false
+  tasks:
+    - name: add nodes to kube_node group
+      group_by:
+        key: 'kube_node'
+
+- name: Add k8s-cluster nodes to k8s_cluster
+  hosts: k8s-cluster
+  gather_facts: false
+  tasks:
+    - name: add nodes to k8s_cluster group
+      group_by:
+        key: 'k8s_cluster'
+
+- name: Add calico-rr nodes to calico_rr
+  hosts: calico-rr
+  gather_facts: false
+  tasks:
+    - name: add nodes to calico_rr group
+      group_by:
+        key: 'calico_rr'
+
+- name: Add no-floating nodes to no_floating
+  hosts: no-floating
+  gather_facts: false
+  tasks:
+    - name: add nodes to no-floating group
+      group_by:
+        key: 'no_floating'