Update version tests to use Ansible 2.5+ syntax

[dudefellah]

This pull request is meant to address the small whitespace problem from #63 so it should equally address #42 and #62.

I did notice that there was another instance of version_compare used in the wildfly_init_src_path template string from defaults/main.yml so I added a fix to that in here as well.

Additionally, by replacing the use of version_compare with is version, Ansible versions 2.2-2.4 would no longer be supported, so I changed the minimum version in meta/main.yml to 2.5. Finally, the pre-commit linting process complained about switching categories to galaxy_tags in the meta/main.yml file as well, so I made that change.

[inkatze]

Thanks, y'all!