Update FSU code to support arbitrary rpc buffers

Added new binrpc command which takes in a base64 encoded buffer
describing the rpc call to be made and makes that rpc call,
returning the results
Removed old rpc code since now have binrpc
Update cmdr module to support firmware pushing and pulling

- firmware can be pushed
- firmware can be pulled
- firmware buckets can be managed
- rpcs are sent using new binrpc command with base64 encoding
Finish removing old rpc code from fsu