MFC r284988, r285220, and r285221.

r284988:
cxgbe(4): request an automatic tx update when a netmap tx queue idles.
The NIC tx queues already do this.

r285220:
cxgbe(4): Do not override the the global defaults for congestion drops.
The hw.cxgbe.cong_drop knob is not affected by this change because the
driver sets up congestion drop on a per-queue basis.

r285221:
cxgbe(4): Add a new knob that controls the congestion response of netmap
rx queues.  The default is to drop rather than backpressure.

This decouples the congestion settings of NIC and netmap rx queues.

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