Test group membership with group_names

Testing for group membership with group names makes Kubespray more
tolerant towards the structure of the inventory.
Where 'inventory_hostname in groups["some_group"] would fail if
"some_group" is not defined, '"some_group" in group_names' would not.

roles/network_plugin/calico/tasks/install.yml

@@ -121,7 +121,7 @@
 
 - name: Calico | kdd specific configuration
   when:
-    - inventory_hostname in groups['kube_control_plane']
+    - ('kube_control_plane' in group_names)
     - calico_datastore == "kdd"
   block:
     - name: Calico | Check if extra directory is needed
@@ -321,7 +321,7 @@
     nodeToNodeMeshEnabled: "false"
   when:
     - peer_with_router | default(false) or peer_with_calico_rr | default(false)
-    - inventory_hostname in groups['k8s_cluster']
+    - ('k8s_cluster' in group_names)
   run_once: true
 
 - name: Calico | Configure Calico BGP
@@ -382,7 +382,7 @@
     - {name: kubernetes-services-endpoint, file: kubernetes-services-endpoint.yml, type: cm }
   register: calico_node_manifests
   when:
-    - inventory_hostname in groups['kube_control_plane']
+    - ('kube_control_plane' in group_names)
     - rbac_enabled or item.type not in rbac_resources
 
 - name: Calico | Create calico manifests for typha
@@ -394,7 +394,7 @@
     - {name: calico, file: calico-typha.yml, type: typha}
   register: calico_node_typha_manifest
   when:
-    - inventory_hostname in groups['kube_control_plane']
+    - ('kube_control_plane' in group_names)
     - typha_enabled
 
 - name: Calico | get calico apiserver caBundle
@@ -421,7 +421,7 @@
     - {name: calico, file: calico-apiserver.yml, type: calico-apiserver}
   register: calico_apiserver_manifest
   when:
-    - inventory_hostname in groups['kube_control_plane']
+    - ('kube_control_plane' in group_names)
     - calico_apiserver_enabled
 
 - name: Start Calico resources
@@ -473,7 +473,7 @@
   with_items:
     - {name: calico, file: calico-ipamconfig.yml, type: ipam}
   when:
-    - inventory_hostname in groups['kube_control_plane']
+    - ('kube_control_plane' in group_names)
     - calico_datastore == "kdd"
 
 - name: Calico | Create ipamconfig resources