Fix DAG Stream support in dag_create()

[Stephen Donnelly <stephen.donnelly () emulex com>]

It appears that when "Have non-interface modules take responsibility for 
identifying their devices" 2426611 
<https://github.com/the-tcpdump-group/libpcap/commit/2426611584e9099af5f98d18ef37337df9bef025> 
was committed, the heuristic for DAG device names was insufficient.

https://github.com/the-tcpdump-group/libpcap/commit/2426611584e9099af5f98d18ef37337df9bef025

The impact is that libpcap cannot capture from DAG streams other than 0, 
which will significantly affect some users.

This issue also affects libpcap_1.4 branch.

DAG capture device names are of the format dagN or dagN:M where N is the 
device number and M is the stream number. The former implies stream 0.

Thanks to joseph.ciccone () emulex com <mailto:joseph.ciccone () emulex com> 
for his initial patch.

I have created a pull request at github:
https://github.com/the-tcpdump-group/libpcap/pull/313

Regards,
Stephen.


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