This should be mostly cosmetic, but it causes switches to number
their ports consistently with OpenFlow 1.0, which starts at 1.
For older versions of OpenFlow, SWITCH_PORT_BASE may be set to zero.

Interactive commands should "work", sort of.

OpenFlow versions > v0.9 require this.

Only tested w/FatTree topo - it's almost a guarantee that this breaks
every other topology.

The OVS interface for this moved to ovs-openflowd.

This functionality was never there for the user-space switch.  Now it's
in.

OVS1.0.1 does not work with veth pairs.

Remove all OpenFlow Ref kmod stuff.

(In user, kernel and ovsk switch classes.)

For some reason, the leading spaces were missing.

On debian, the module blacklist is blacklist, not
blacklist.conf.

Minor cosmetic change, really.

Note now that we can pass options into switches; for example,
we could enable stp with Switch( 's1', opts='--stp' ).

It seems that it is more convenient to be able to call

cmd( 'foo', 'bar', 1)

for example. However, this may make it slightly less
efficient, so we will see how it works.

Link check wasn't quite right - e.g. 'eth1' could be found in
'eth10' previously.

Updated quietRun to allow passing in args directly rather than
as a list.

I'm still not 100% sure on this.