Fix downloading SNAPSHOT and LATEST artifacts

[yurinnick]

Fix artifact_file downloading file name for SNAPSHOT and LATEST Nexus artefacts.

[KAllan357]

Could you give a bit more detail on what this is accomplishing?

[yurinnick]

If you tried to download any SNAPSHOT or LATEST artefact from Nexus using artifact_file - you will get a checksum error, because downloaded filename won't match specified in resource. My fix - just rename it after download.

[gregsymons]

Why does the behavior of get_actual_version have to change here? This was put in so that SNAPSHOT versions resolve to their unique versions. I put this in so that I could report the actual artifact deployed for traceability purposes. Changing this behavior will definitely break my use case.

[dashirov]

I'm struggling with the same issue and was able to address "latest", but not "snapshot". There is definitely a design flaw that no one cares to address - it's been reported a year ago if not earlier.