Don't fetch signatures in WSPR before each RPC.
Don't fetch signatures in WSPR before each RPC.

We fetch the signatures in JS when bind is called, so this is redundant
and causing slowness.

Change-Id: I28461cffd365ac3f0044ba85691d4fa7b2ec174a

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