Allow uppercase characters in image reference hostname #20209
Merged
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NOTE: This is a version of #20175 against master. Master needs a separate PR because it vendors a different branch of distirbution.
This PR makes restores the pre-Docker 1.10 behavior of allowing
uppercase characters in registry hostnames.
Note that this only applies to hostnames, not remote image names.
Previous versions also prohibited uppercase letters after the hostname,
but Docker 1.10 extended this to the hostname itself.
letters.
TestTagInvalidUnprefixedRepo
Fixes: #20056