fabfile: don't disable autoneg, split interrupt moderation config
fabfile: don't disable autoneg, split interrupt moderation config

- I can't think of a reason why auto-negotiation should hurt these
  measurements (as long as all upped interfaces have a link) and
  letting it enabled in fact doesn't appear to have an impact. More
  importantly, though, at least 1 G and 10 G Ethernet require the
  master and slave config to be manually set when auto-negotiation
  is disabled. So the previous setup actually was illegal but worked
  for unobvious reasons (besides being prone to duplex mismatches).
- Apparently, at least the Linux igb driver doesn't properly disable
  interrupt moderation when the count-based one (see 6f1b2475) is
  disabled along with time-based and adaptive flavor. Separating the
  former from these latter seems to work around the problem.

NTAP/warpcore,NTAP/warpcore,NTAP/warpcore,NTAP/warpcore