Define default address family according to IPv6 support enabled.

Use this new default in start_listener() as AF_INET and PF_INET means the same:
http://stackoverflow.com/questions/2549461/what-is-the-difference-between-af-inet-and-pf-inet-constants


git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@9774 4b0bc96b-bc66-0410-9d44-ebda105a78c1
dvbapi: make network mode work also on IPv6


git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@9775 4b0bc96b-bc66-0410-9d44-ebda105a78c1