Default interface mismatch with internal default.

[DavidBKelley]

The "interface" property defaults to "eth1" but the curr_attach.eth_dev defaults to "eth0" in
__constructor__(). This causes the component to actually default to using "eth0" contrary to the "interface" property default. Additionally attempts to set the interface to "eth1" fail because the code does not recognize that a change is being made. A work around is to first set the interface to "lo" and then set it to "eth1".