[tests] Fixed possible TestIPv6 hangups if connection fails
[tests] Fixed possible TestIPv6 hangups if connection fails

Cinegy/srt,ethouris/srt,Haivision/srt,Cinegy/srt,Cinegy/srt,ethouris/srt,Haivision/srt,Cinegy/srt,Haivision/srt,Haivision/srt,ethouris/srt,ethouris/srt