Combination Submit/getwork

[0xdade]

We could save some network overhead by introducing a control flag in the submitted data (that doesn't get stored in elastic) that says "I'm about to ask for work again so why don't you just give it to me now?"

This will save a separate HTTP connection and the associated overhead with that, which, while not large individually, is another place we can add some optimizations, both in terms of bandwidth overhead as well as latency (because we won't have to wait for the server twice).