MEDIUM: cli: Add payload support

In order to use arbitrary data in the CLI (multiple lines or group of words
that must be considered as a whole, for example), it is now possible to add a
payload to the commands. To do so, the first line needs to end with a special
pattern: <<\n. Everything that follows will be left untouched by the CLI parser
and will be passed to the commands parsers.

Per-command support will need to be added to take advantage of this
feature.

Signed-off-by: Aurélien Nephtali <aurelien.nephtali@corp.ovh.com>
diff --git a/src/hlua.c b/src/hlua.c
index 5096768..da56110 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -6926,7 +6926,7 @@
 /* This function initialises Lua cli handler. It copies the
  * arguments in the Lua stack and create channel IO objects.
  */
-static int hlua_cli_parse_fct(char **args, struct appctx *appctx, void *private)
+static int hlua_cli_parse_fct(char **args, char *payload, struct appctx *appctx, void *private)
 {
 	struct hlua *hlua;
 	struct hlua_function *fcn;