Remove deprecated include for static tasks and use instead import_tasks fix #131

[HelioCampos]

This PR removes the warning messages given by ansible 2.4.0 regarding the deprecation of the "include:" directive and uses the recommended new directive to include static tasks "import_tasks". It fixes #131

[rndmh3ro]

Thanks foru the PR!
Ansible 2.4.0 isn't released yet, and import_tasks does not exist in 2.3.
So we'll have to wait until Ansible 2.4 is released and available in all major repositories.

[rndmh3ro]

Ansible is still 2.3.0 in Centos 6, so we have to wait for it.

[rndmh3ro]

Hey @HelioCampos,
Ansible 2.4 is out now since some time and I'd like to merge it. There are two small remaining issues:

• A new include was added, can you please fix this, too: https://github.com/dev-sec/ansible-os-hardening/pull/132/files#diff-2444ad0870f91f17ca6c2a5e96b26823R22
• Can you update the minimum ansible version to 2.4 here and here?

Thanks!

[rndmh3ro]

I rebased and merged, thanks! :)