v23: Minor cleanup of usage of rpc.ListenAddrs.
v23: Minor cleanup of usage of rpc.ListenAddrs.

Change-Id: I3d7c5d3f959216333d429e18c9b001be8b78aeb7
MultiPart: 1/2

vanadium/go.v23,vanadium/go.v23,vanadium/go.v23