[dsc] Allow multiple bpf_program and append content

[Jerry Lundström]

Hi Klaus,

On 01/16/17 17:30, Klaus Darilion wrote:
> Not a "must", but makes long filter more readable.
> 
> Correct sampling is more important ;-)

And that has been the only thing I've worked on for several weeks now
and making great progress, sending update later today.

Cheers,
Jerry