nspawn: correct task names

The tasks were incorrectly named, those running on physical host
were labeled as container and vice versa.  This patches fixes that.

Change-Id: I56f5770edc7074e06054e1c79730bf7f9a82c146

playbooks/common-tasks/os-nspawn-container-setup.yml

@@ -37,7 +37,7 @@
     - skip_ansible_lint
     - always
 
-- name: Ensure mount directories exists (container)
+- name: Ensure mount directories exists (physical host)
   file:
     path: "{{ item['mount_path'] }}"
     state: "directory"
@@ -47,7 +47,7 @@
   tags:
     - common-nspawn
 
-- name: Ensure mount directories exists (physical host)
+- name: Ensure mount directories exists (container)
   file:
     path: "{{ item['bind_dir_path'] }}"
     state: "directory"