Only emit tls_hostname deprecation warning if TLS is actually used

[felixfontein]

SUMMARY

Right now it is also emitted if TLS is not used to talk to Docker daemon.

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

plugins/module_utils/common.py

[ssbarnea]

@felixfontein I observed these really annoying warnings with molecule-docker driver and I failed to find any combination of arguments to give to docker modules that would avoid creating these warnings.

That is weird because I usually use a remove docker host using SSH, like DOCKER_HOST=ssh://ssbarnea@example.com which is secure by definition and still not TLS related.

Note: disabling all Ansible warnings is no option, it would be a very irresponsible move.

[ssbarnea]

I confirm that this fix address the issue for for those using ssh:// too.

[felixfontein]

@ssbarnea thanks for testing/reviewing!