Update alt-registry tests to the use the new interface.
Update alt-registry tests to the use the new interface.

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