* repro: support --pull
This option allows run-cache to pull the cache for the outputs
when restoring a stage instead of pulling everything at once during
`dvc pull --run-cache`.
Fixes#4223
* repro: adjust --pull help
By itself `self.info` is quite confusing, as it is not clear what it is
about. Using `hash_info` makes much more sense and is required to
support alternative hash types.
Related to #4144, #3069, #1676