"Ensure Varnish VMODs are installed" emits deprecation notice

[Bilge]

TASK [geerlingguy.varnish : Ensure Varnish VMODs are installed.] *******************************************************
[DEPRECATION WARNING]: evaluating u'varnish_modules_package_name' as a bare variable, this behaviour will go away and
you might need to add |bool to the expression in the future. Also see CONDITIONAL_BARE_VARS configuration toggle. This
feature will be removed in version 2.12. Deprecation warnings can be disabled by setting deprecation_warnings=False in
ansible.cfg.

This seems to be caused by https://github.com/geerlingguy/ansible-role-varnish/blob/122aa0f8a386d98f6d2e66406ac2f4db1d90e34e/tasks/setup-Debian.yml#L31

If one actually sets varnish_modules_package_name: varnish-modules, as is presumably the intended use of this feature, not only does it emit the deprecation notice but it also causes a fatal error:

fatal: [REDACTED]: FAILED! => {"msg": "The conditional check 'varnish_modules_package_name' failed. The error was: error while evaluating conditional (varnish_modules_package_name): 'varnish' is undefined\n\nThe error appears to be in '~/.ansible/roles/geerlingguy.varnish/tasks/setup-Debian.yml': line 27, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Ensure Varnish VMODs are installed.\n ^ here\n"}

[adepretis]

@Bilge unfortunately I can not reproduce this with Ansible 2.14 and I had it running with Ansible > 2.10 for quite some time.

I made a small change that might help though - can you try it please?

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