reference: remove support for deprecated "shortid" refs #3774
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The "shortid" syntax was added in moby/moby@d26a3b3 (moby/moby#799), and allowed for matching an image on its ID prefix (this is before images were content-addressable). With the introduction of content-addressable references, this syntax became problematic, and Docker deprecated this syntax in 2016 (Docker v1.13.0) through commit; moby/moby@5fc7159 (moby/moby#27207):
Support for this syntax was removed in 2017 (Docker 17.12) through commit: moby/moby@a942c92 (moby/moby#35790)
containerd uses a fork of the reference package with this syntax removed, and does not support this syntax:
containerd/containerd@901bcb2 (containerd/containerd#3728)
This patch removes the deprecated syntax, the ParseAnyReferenceWithSet function, and the ShortIdentifierRegexp regex.
As there are no external consumers for this function, nor the regexp, I'm skipping a deprecation cycle for this;