flow/manager: Unwrap verrors to make TestServerPublicKeyOpt pass.
flow/manager: Unwrap verrors to make TestServerPublicKeyOpt pass.

Change-Id: I3a5bad7510ac65a5561cf79984ec38da00f8f2c3

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref