Network extensions

@icecrime 
It only does for now. There’s no way (that I can see, at least) of passing this information to the driver yet.

-Erik

> On Dec 4, 2014, at 6:57 PM, Arnaud Porterie <notifications@github.com> wrote:
> 
> In extensions/simplebridge/driver.go:
> 
> >  // discovery driver? should it be hooked here or in the core?
> >  func (d *BridgeDriver) Link(id, name string, s sandbox.Sandbox, replace bool) (network.Endpoint, error) {
> > +	if vethNameTooLong(name) {
> My point was just that the name parameter shouldn't be dictating the name of the interface (it's mostly a "hostname").
> 
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