rename '--host' to '--index', add comments marked as TODO where host should be removed/repurposed
rename '--host' to '--index', add comments marked as TODO where host should be removed/repurposed

vojtechkral/cargo,achanda/cargo,nipunn1313/cargo,tshepang/cargo,achanda/cargo,tsurai/cargo,eminence/cargo,vojtechkral/cargo,nipunn1313/cargo,rust-lang/cargo,eminence/cargo,eminence/cargo,rust-lang/cargo,rust-lang/cargo,nipunn1313/cargo,achanda/cargo,rustyhorde/cargo,tsurai/cargo,achanda/cargo,tshepang/cargo,vojtechkral/cargo,tsurai/cargo,nipunn1313/cargo,tsurai/cargo,vojtechkral/cargo,tsurai/cargo,tshepang/cargo,rustyhorde/cargo,tshepang/cargo,rustyhorde/cargo,eminence/cargo,rust-lang/cargo,rustyhorde/cargo