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

reset.yml

@@ -2,14 +2,8 @@
 - 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: bastion[0]
   gather_facts: False
@@ -21,7 +15,7 @@
 - name: Gather facts
   import_playbook: facts.yml
 
-- hosts: etcd:k8s-cluster:calico-rr
+- hosts: etcd:k8s_cluster:calico_rr
   gather_facts: False
   vars_prompt:
     name: "reset_confirmation"