Remove dockerfile from context

This simply ensures the Dockerfile is removed from the context.

/cc @tiborvass @vieux @tianon 

closes #8330 


I’m not sure how that got in there. Fixed.

On Oct 6, 2014, at 11:00 AM, Sebastiaan van Stijn <notifications@github.com> wrote:

> In api/client/commands.go:
> 
> > @@ -2365,7 +2366,10 @@ func (cli *DockerCli) CmdSave(args ...string) error {
> >  		if err != nil {
> >  			return err
> >  		}
> > +	} else if cli.isTerminalOut {
> > +		return errors.New("Cowardly refusing to save to a terminal. Use the -o flag or redirect.")
> Is this change related? Seems like another issue you were working on?
> 
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