Incorrect file checking

[tyuio9]

Description

On the Ubuntu when ubuntu_iptables is being enabled, firewall rules get created twice. First, it creates a file with default rules, it restarts the firewall and then it creates a file with rules defined with firewall_rule resource. This actually, causes a security bug, I guess. The firewall gets opened for the short amount of time (this time varies on the chef run) but when allow_established (the default is true) is being employed it makes a possibility to create a connection behind the firewall and this connection won't be killed when proper rules are in place.

Check List

• [x] All tests pass. See https://github.com/chef-cookbooks/community_cookbook_documentation/blob/master/TESTING.MD
• [x] All commits have been signed for the Developer Certificate of Origin. See https://github.com/chef-cookbooks/community_cookbook_documentation/blob/master/CONTRIBUTING.MD

[martinb3]

I've adjusted this slightly in 42b6b415c3fb78b7737ad9746fe56acd7be5a724 to remove the version bump, and created #173.