Add dependency `registry` to `cargo metadata`.#6500

Merged

bors merged 2 commits intorust-lang:masterfrom ehuss:metadata-reg

Jan 2, 2019

+930-341

Commits on Dec 30, 2018

Add dependency registry to cargo metadata.
ehuss
committed

Commits on Dec 31, 2018

Fix registry-index bug.
ehuss
committed