[rbp/omxplayer] Fix for hang following seek after eos

If you seek after the demuxer eof, the eof state is cleared, but we are not clearing the flags relating to sending eos stream to audio/video players
Merge pull request #2755 from popcornmix/hang_eos_seek

[rbp/omxplayer] Fix for hang following seek after eos
[fix] restrict path access through UPnPServer