proxy: The proxy shouldn't hang if a single "startRouting" request hangs.
proxy: The proxy shouldn't hang if a single "startRouting" request hangs.

This was causing a deadlock in production.

Change-Id: I64da9ddf610fe26ab2388e8db151de8ec62d0c53

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