This method is a shallow wrapper around trust.GetNotaryRepository, but
due to its signature resulted in the trust package, and notary dependencies
to become a dependency of the CLI. Consequence of this was that cli-plugins,
which need the cli/command package, would also get notary and its
dependencies as a dependency. It is no longer used in our code, which
constructs the client in packages that need it, so we can deprecate this
method.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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