mirage/config: Set "namespace" property to avoid repetition
mirage/config: Set "namespace" property to avoid repetition

steveklabnik/crates.io,steveklabnik/crates.io,rust-lang/crates.io,steveklabnik/crates.io,steveklabnik/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io