iface.py  - in `has_ip` run `get_ip_addrs` if ipaddrs attr is empty
iface.py - add additional test in has_ip() to check for missing ipaddrs attr and
if if it is none. the case where attr is missing shouldn't happen but doesn't
hurt to put the check in
delete unneeded VERSION file
begin serious devel and testing with python3. fix importing issues
and tests associated with making yalnp-lib 2.7 and 3.x compliant
add capability to identify mgmt ports on a particular linux device.
add capability to detect mgmt ports on Cumulus Linux
mgmt_port_check tests all pass with python 3.4 and 2.7
arp.py - make it python 2.7 and 3.x compliant. add tests..forgot to do that.
test_arp.py - fix test to make work on python 3.x
fix bug where if you specify 'downlink2', 'downlink' it crashes.