Restore compatibility with Chef < 12.4
Restore compatibility with Chef < 12.4

shell_out isn't in the resource class before 12.4. See:

https://github.com/chef/chef/pull/3418

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

opscode-cookbooks/apt,opscode-cookbooks/apt,chef-cookbooks/apt,protec-cookbooks/apt,protec-cookbooks/apt,chef-cookbooks/apt