Replace kube-master with kube_control_plane (#7256)

This replaces kube-master with kube_control_plane because of [1]:

  The Kubernetes project is moving away from wording that is
  considered offensive. A new working group WG Naming was created
  to track this work, and the word "master" was declared as offensive.
  A proposal was formalized for replacing the word "master" with
  "control plane". This means it should be removed from source code,
  documentation, and user-facing configuration from Kubernetes and
  its sub-projects.

NOTE: The reason why this changes it to kube_control_plane not
      kube-control-plane is for valid group names on ansible.

[1]: https://github.com/kubernetes/enhancements/blob/master/keps/sig-cluster-lifecycle/kubeadm/2067-rename-master-label-taint/README.md#motivation

tests/testcases/010_check-apiserver.yml

@@ -1,5 +1,5 @@
 ---
-- hosts: kube-master
+- hosts: kube_control_plane
 
   tasks:
   - name: Check the API servers are responding

tests/testcases/015_check-nodes-ready.yml

@@ -1,5 +1,5 @@
 ---
-- hosts: kube-master[0]
+- hosts: kube_control_plane[0]
   tasks:
 
   - name: Force binaries directory for Flatcar Container Linux by Kinvolk

tests/testcases/020_check-pods-running.yml

@@ -1,5 +1,5 @@
 ---
-- hosts: kube-master[0]
+- hosts: kube_control_plane[0]
   tasks:
 
   - name: Force binaries directory for Flatcar Container Linux by Kinvolk

tests/testcases/030_check-network.yml

@@ -1,5 +1,5 @@
 ---
-- hosts: kube-master[0]
+- hosts: kube_control_plane[0]
   vars:
     test_image_repo: busybox
     test_image_tag: latest

tests/testcases/040_check-network-adv.yml

@@ -37,7 +37,7 @@
       until: ncs_pod.stdout.find('Running') != -1
       retries: 3
       delay: 10
-      when: inventory_hostname == groups['kube-master'][0]
+      when: inventory_hostname == groups['kube_control_plane'][0]
 
     - name: Wait for netchecker agents
       shell: "set -o pipefail && {{ bin_dir }}/kubectl get pods -o wide --namespace {{ netcheck_namespace }} | grep '^netchecker-agent-.*Running'"
@@ -48,12 +48,12 @@
       retries: 3
       delay: 10
       failed_when: false
-      when: inventory_hostname == groups['kube-master'][0]
+      when: inventory_hostname == groups['kube_control_plane'][0]
 
     - name: Get netchecker pods
       command: "{{ bin_dir }}/kubectl -n {{ netcheck_namespace }} describe pod -l app={{ item }}"
       run_once: true
-      delegate_to: "{{ groups['kube-master'][0] }}"
+      delegate_to: "{{ groups['kube_control_plane'][0] }}"
       no_log: false
       with_items:
         - netchecker-agent
@@ -63,14 +63,14 @@
     - debug:
         var: nca_pod.stdout_lines
       failed_when: not nca_pod is success
-      when: inventory_hostname == groups['kube-master'][0]
+      when: inventory_hostname == groups['kube_control_plane'][0]
 
     - name: Get netchecker agents
       uri:
         url: "http://{{ ansible_default_ipv4.address }}:{{ netchecker_port }}/api/v1/agents/"
         return_content: yes
       run_once: true
-      delegate_to: "{{ groups['kube-master'][0] }}"
+      delegate_to: "{{ groups['kube_control_plane'][0] }}"
       register: agents
       retries: 18
       delay: "{{ agent_report_interval }}"
@@ -94,7 +94,7 @@
         url: "http://{{ ansible_default_ipv4.address }}:{{ netchecker_port }}/api/v1/connectivity_check"
         status_code: 200
         return_content: yes
-      delegate_to: "{{ groups['kube-master'][0] }}"
+      delegate_to: "{{ groups['kube_control_plane'][0] }}"
       run_once: true
       register: result
       retries: 3
@@ -115,13 +115,13 @@
       command: "{{ bin_dir }}/kubectl -n kube-system logs -l k8s-app=kube-proxy"
       no_log: false
       when:
-        - inventory_hostname == groups['kube-master'][0]
+        - inventory_hostname == groups['kube_control_plane'][0]
         - not result is success
 
     - name: Get logs from other apps
       command: "{{ bin_dir }}/kubectl -n kube-system logs -l k8s-app={{ item }} --all-containers"
       when:
-        - inventory_hostname == groups['kube-master'][0]
+        - inventory_hostname == groups['kube_control_plane'][0]
         - not result is success
       no_log: false
       with_items:
@@ -184,7 +184,7 @@
           }'
           EOF
       when:
-        - inventory_hostname == groups['kube-master'][0]
+        - inventory_hostname == groups['kube_control_plane'][0]
         - kube_network_plugin_multus|default(false)|bool
 
     - name: Annotate pod with macvlan network
@@ -208,7 +208,7 @@
               image: dougbtv/centos-network
           EOF
       when:
-        - inventory_hostname == groups['kube-master'][0]
+        - inventory_hostname == groups['kube_control_plane'][0]
         - kube_network_plugin_multus|default(false)|bool
 
     - name: Check secondary macvlan interface
@@ -218,5 +218,5 @@
       retries: 90
       changed_when: false
       when:
-        - inventory_hostname == groups['kube-master'][0]
+        - inventory_hostname == groups['kube_control_plane'][0]
         - kube_network_plugin_multus|default(false)|bool

tests/testcases/100_check-k8s-conformance.yml

@@ -1,5 +1,5 @@
 ---
-- hosts: kube-master[0]
+- hosts: kube_control_plane[0]
   vars:
     sonobuoy_version: 0.20.0
     sonobuoy_arch: amd64

tests/testcases/roles/cluster-dump/tasks/main.yml

@@ -2,17 +2,17 @@
 - name: Generate dump folder
   command: "{{ bin_dir }}/kubectl cluster-info dump --all-namespaces --output-directory /tmp/cluster-dump"
   no_log: true
-  when: inventory_hostname in groups['kube-master']
+  when: inventory_hostname in groups['kube_control_plane']
 
 - name: Compress directory cluster-dump
   archive:
     path: /tmp/cluster-dump
     dest: /tmp/cluster-dump.tgz
-  when: inventory_hostname in groups['kube-master']
+  when: inventory_hostname in groups['kube_control_plane']
 
 - name: Fetch dump file
   fetch:
     src: /tmp/cluster-dump.tgz
     dest: "{{ lookup('env', 'CI_PROJECT_DIR') }}/cluster-dump/{{ inventory_hostname }}.tgz"
     flat: true
-  when: inventory_hostname in groups['kube-master']
+  when: inventory_hostname in groups['kube_control_plane']