start consolidation of ifconfig/ip/set_interface

* try to factor all the ifconfig/ip set dev code to single location
	  (currently networks/set_interface, though I recommend a different name
	  for this function because it's too close in name and different
	  in functionality from set_iface, set_profile).

	* added "forcedown" option to set_interface, meaning "just go down
	  don't worry about 'nodown' quirks"

	* even with "forcedown", this factoring would introduce "ip addr
	  flush dev $INTERFACE" calls to existing code. I assume that's
	  harmless? or even beneficial?

	* one code block (in ethernet_iproute) had stdout,stderr of the
      down calls redirected to /dev/null. I've moved that to
	  set_interface, so now everyone's getting that behavior. I assume
	  that's appropriate...

	* now no more calls to "ip" or "ifconfig" outside of set_interface,
	  except the checks for NO-CARRIER after ethernet*/set_interface up.
      They might also be moved to network/set_interface?

	* as of this commit, all the set_interface calls are now using ip
	  instead of ifconfig. A subsequent commit will isolate the ip-use
	  to ethernet-iproute and the ifconfig-use to ethernet.

	* ALERT: attend to wireless_down, it seems to be calling
	  set_interface down twice (once in ethernet_down, once in itself).
	  And neither this commit nor the code it's patching respects
	  quirk nodown in the ethernet_down block.

Signed-off-by: Jim Pryor <profjim@jimpryor.net>

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