Changes for compatibility with Ansible > 2.4, fixes for #211

[platini2]

What does this PR do?

Makes snaps-openstack to work with ansible > 2.4

Do you have any concerns with this PR?

Testing with other versions different than 2.7.2 of ansible

How can the reviewer verify this PR?

Install ansible 2.7 and run

Any background context you want to provide?

Screenshots or logs (if appropriate)

Questions:

• Have you connected this PR to the issue it resolves?
• Does the documentation need an update?
• Does this add new Python dependencies?
• Have you added unit or functional tests for this PR?
• Does this patch update any configuration files?

[bo-quan]

@platini2 I agree with @spisarski, especially due to the vulnerability issue with ansible version <2.4.5 (see https://github.com/cablelabs/snaps-openstack/issues/206)

[platini2]

Ok, so if we agree that, I can remove all the logic to be backward compatible to support ansible < 2.4

[platini2]

reverted previous commits and included changes in a single commit to make it compatible with ansible > 2.4 and require ansible over 2.4.5

[platini2]

There are some other pep8 failures but not on the files that I changed in this commit.

[RandyLevensalor]

@spisarski @bo-quan It looks like the pep8 issues were introduced in a different PR. Can we approve this PR, since it didn't add the pep8 issues?