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

remove-node.yml

@@ -2,16 +2,10 @@
 - name: Check ansible version
   import_playbook: ansible_version.yml
 
-- name: Add kube-master nodes to kube_control_plane
-  # This is for old inventory which contains kube-master instead of 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: Ensure compatibility with old groups
+  import_playbook: legacy_groups.yml
 
-- hosts: "{{ node | default('etcd:k8s-cluster:calico-rr') }}"
+- hosts: "{{ node | default('etcd:k8s_cluster:calico_rr') }}"
   gather_facts: no
   environment: "{{ proxy_disable_env }}"
   vars_prompt:
@@ -34,7 +28,7 @@
     - { role: bootstrap-os, tags: bootstrap-os }
     - { role: remove-node/pre-remove, tags: pre-remove }
 
-- hosts: "{{ node | default('kube-node') }}"
+- hosts: "{{ node | default('kube_node') }}"
   gather_facts: no
   environment: "{{ proxy_disable_env }}"
   roles: