DVBlast hangs when dvb_Reset() in ASI mode. When using ASI as input there is no
need to reset the device and especially resetting a DVB device is wrong. Therefor
abstract the call to dvb_Reset() and replace it with pf_Reset(). Also the udp input
is adapted to provide a function for pf_Reset(). Both asi_Reset() and udp_Reset()
do nothing.

git-svn-id: svn://svn.videolan.org/dvblast/trunk@171 55d3f8b6-4a41-4d2d-a900-313d1436a5b8