test: increase rpc ack timeout in rerouting tests
test: increase rpc ack timeout in rerouting tests

The tests don't mock ack behaviour, so the rpc objects were sometimes
being destroyed by an ack timeout before the tests ran.

deepstreamIO/deepstream.io,hoxton-one/deepstream.io,deepstreamIO/deepstream.io,deepstreamIO/deepstream.io,hoxton-one/deepstream.io