Use ifconfig for interface verification.
Previously we were using both ip link and ifconfig - not only isthis inconsistent and redundant, but it also broke when newerip link changed the reported names of certain interfacs to"h1-eth0@36:".
Spacing tweaks for pep8 checker
hwintf.py: allow intf to be specified in cmd line
pass code check
Change to use Intf() class rather than string for interface.
Was broken in 2.0.0rc1
pep8: fix E128 continuation line under-indented errors
I wasn't sure this was worth fixing at first, but it does look more readablenow.
Modified to add eth1.
Added example of adding hw interface to mininet.