Merge changes I71b8d3f5,Ie360848b,I6705aa19,I58d1972a,I2e4658ca, ...

* changes:
  rusty-gd: hci facade completes command to ACK receive
  rusty-gd: don't put payloads, the size has already been allocated
  rusty-gd: take vector sizes into account
  rusty-gd: move write_to logic to parent_def
  rusty-gd: move size field to packet gen
  rusty-gd: Write correct size and compute it once