Finally nail the race which made H2 tests randomly "just not work":
Finally nail the race which made H2 tests randomly "just not work":

One cannot use a counter as boolean when you have both waiters and
read ahead,  if one frame heas been read ahead and one stream is
waiting for another frame, the counter will be zero indicating
no frames should be read.

feld/Varnish-Cache,gquintard/Varnish-Cache,feld/Varnish-Cache,feld/Varnish-Cache,feld/Varnish-Cache,gquintard/Varnish-Cache,gquintard/Varnish-Cache,feld/Varnish-Cache,gquintard/Varnish-Cache