Remove warn argument for command/shell

Since ansible-core 2.14 you can't use warn as module argument.

Instead, a tag is used to instruct ansible-lint to
supress alerts.

Change-Id: I4ceeee4bf6c1020851824450ec7b30f6d14573f3

tasks/python_venv_install_symlink.yml

@@ -28,10 +28,10 @@
     {{ (ansible_facts['pkg_mgr'] == 'apt') | ternary('dpkg -L ' ~ (venv_packages_to_symlink | join(' ')), 'rpm -ql ' ~ (venv_packages_to_symlink | join(' ')) ) }}
     | egrep '^.*{{ _venv_python_major_version }}.*/(site|dist)-packages/.*'
     | egrep -v "__pycache__"
-  args:
-    warn: no
   changed_when: false
   register: _python_files
+  tags:
+    - skip_ansible_lint
 
 - name: Link the python host package files into venv
   vars: