Fix cloud_provider check (#8164)

This fixes the preinstall check for cloud_provider option based on
inventory/sample/group_vars/all/all.yml

roles/kubernetes/preinstall/tasks/0020-verify-settings.yml

@@ -183,8 +183,8 @@
 
 - name: check cloud_provider value
   assert:
-    that: cloud_provider in ['generic', 'gce', 'aws', 'azure', 'openstack', 'vsphere', 'oci', 'external']
-    msg: "If set the 'cloud_provider' var must be set either to 'generic', 'gce', 'aws', 'azure', 'openstack', 'vsphere', or external"
+    that: cloud_provider in ['gce', 'aws', 'azure', 'openstack', 'vsphere', 'oci', 'external']
+    msg: "If set the 'cloud_provider' var must be set either to 'gce', 'aws', 'azure', 'openstack', 'vsphere', 'oci' or 'external'"
   when:
     - cloud_provider is defined
     - not ignore_assert_errors