fixup/dist: Construct auth hyper server in Tokio 0.2 context
fixup/dist: Construct auth hyper server in Tokio 0.2 context

This fixes a run-time error otherwise encountered in tests/oauth.rs

luser/sccache2,luser/sccache2,mozilla/sccache,mozilla/sccache,mozilla/sccache,luser/sccache2,luser/sccache2