Support registering tool attributes from command line and un-support `Registry::register_attribute`#57921

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petrochenkov wants to merge 2 commits intorust-lang:masterfrom

petrochenkov:tool

Commits on Jan 26, 2019

resolve: Support registering tool attributes from command line
petrochenkov
committed
legacy plugins: Unsupport `Registry::register_attribute`
petrochenkov
committed