Add support for SNI logging

templates/haproxy_cfg.jinja2

@@ -13,7 +13,7 @@ global
 
 defaults
   log global
-  log-format %ci:%cp\ [%T]\ %ft\ %b/%s\ %Tq/%Tw/%Tc/%Tr/%Tt\ %ST\ %B\ %CC\ %CS\ %tsc\ %ac/%fc/%bc/%sc/%rc\ %sq/%bq\ %hr\ %hs\ %{+Q}r
+  log-format %ci:%cp\ [%T]\ %ft\ %b/%s\ %Tq/%Tw/%Tc/%Tr/%Tt\ %ST\ %B\ %CC\ %CS\ %tsc\ %ac/%fc/%bc/%sc/%rc\ %sq/%bq\ %[ssl_fc_sni]\ %hr\ %hs\ %{+Q}r
   mode http
   option dontlognull
   timeout connect {{ proxy_timeout_connect }}