BUG/MINOR: http-ana: Update analyzers on both sides when switching in TUNNEL mode

BUG/MINOR: http-ana: Update analyzers on both sides when switching in TUNNEL mode

The commit 9704797fa ("BUG/MEDIUM: http-ana: Properly switch the request in
tunnel mode on upgrade") fixes the switch in TUNNEL mode, but only
partially. Because both channels are switch in TUNNEL mode in same time on
one side, the channel's analyzers on the opposite side are not updated
accordingly. This prevents the tunnel timeout to be applied.

So instead of updating both sides in same time, we only force the analysis
on the other side by setting CF_WAKE_ONCE flag when a channel is switched in
TUNNEL mode. In addition, we must take care to forward all data if there is
no DATAa TCP filters registered.

This patch is related to the issue #2125. It is 2.8-specific. No backport
needed.