Add a helper to see if an interface is a loopback adaptor.
Fix up bond mode changing a bit, and don't fail if a nic object is
passed to Nic.new
Merge pull request #115 from VictorLowther/pull-req-release-pebbles-master-dd3666f0c95a7d5b43e788a8e2c8b5d2e1e2e7bd

Handle abandoning a nic when the network barclamp takes over a system. [2/4]