k-flows: In-kernel network flow summary statistics

Run klog make, defaulting to alone and silent, builds a standalone kernel module.

For openvswitch support, run klog make ovs <ovs dir>, where <ovs dir> points to the ovs directory.

The last argument of klog make is always either verbose or silent.

Once either module is compiled, load it with klog start.

If compiled with openvswitch, start with klog start <ovs dir>/datapath/linux, i.e. the path to the module.

Unload it with klog stop.

In summary:

a) For a stand-alone version,

$ sudo klog make
$ sudo klog start

b) For a version compatible with openvswitch 1.2.1 (cf. homework at github),

$ sudo klog make ovs $HOME/homework/openvswitch.git
$ sudo klog start $HOME/homework/openvswitch.git/datapath/linux