_artifactcache.py: display the actual key being pulled

Abderrahim Kitounirequested to merge
abderrahim/non-strict-key-display into master

Description

This makes ArtifactCache.pull use the (abbreviated) key passed to it rather than querying the element for its key (which might be unknown if we are in non-strict mode).

This merge request, when approved, will close: #981 (closed)

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