Isolate ip to ethernet-iproute, ifconfig to ethernet + wireless

* The point of having both ethernet and ethernet-iproute
	  was presumably to transition slowly from ifconfig/net-tools to
	  iproute2. But the current codebase mixes the two in handling
	  ethernet and wireless connections. This commit separates
	  all the ip calls to the newer connections, and the ifconfig
	  calls to the older connections. The latter now call set_interface
	  with up-old, down-old, forcedown-old.

	* I'm not urging that ifconfig code sticks around. Just trying
	  to make the code consistent with what seems to me to be
	  its implicit design principles.

	* the check for NO-CARRIER in ethernet is now also done without
      calling iproute2 tools. I saw this technique recommended somewhere
	  but have no citation. I don't know how many kernel revisions one
      can rely on any given part of /sys to remain stable for.
      It may be possible to achieve the same goal here in other ways.
	  If in fact it's worth the effort to keep the ifconfig code
	  around.

	* Began also to integrate the IPROUTE variable introduced in
	  ethernet, but stopped. If that's integrated everywhere, shouldn't
	  it make connection=ethernet equivalent to
      connection=ethernet-iproute? Is there justification for
	  using it at some places but not everywhere? I just let it alone
      for now.

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

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