The strslice.StrSlice type is a string-slice with a custom JSON Unmarshal
function to provide backward-compatibility with older API requests from
before docker 1.7 (see [moby@17d6f00] and [moby@ea4a067]), which used a
string instead of an array of strings for some fields (Cmd, Entrypoint).
We no longer support those API versions, and we no longer support pulling
v1 images that may contain such a config, so we can deprecate the type
and remove its use.
[moby@17d6f00]: 17d6f00ec2
[moby@ea4a067]: ea4a06740b
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>