Remove the tcplog option from haproxy configs

Adding the tcplog option to an haproxy backend definition overrides
the default log format. Remove it so the supplied default (which we
based on the tcplog built-in default with some additions) will be
used instead.

Change-Id: Id302dede950c1c2ab8e74a662cc3cb1186a6593d

playbooks/roles/haproxy/templates/haproxy.cfg.j2

@@ -27,7 +27,6 @@ listen {{ listener.name }}
   {% endfor %}
   mode tcp
   balance source
-  option tcplog
   option tcp-check
 
   {% for server in listener.servers %}