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/stick_table.c b/src/stick_table.c
index 73c70d3..3e44747 100644
--- a/src/stick_table.c
+++ b/src/stick_table.c
@@ -3375,7 +3375,7 @@
 }
 
 /* returns 0 if wants to be called, 1 if has ended processing */
-static int cli_parse_table_req(char **args, struct appctx *appctx, void *private)
+static int cli_parse_table_req(char **args, char *payload, struct appctx *appctx, void *private)
 {
 	appctx->ctx.table.data_type = -1;
 	appctx->ctx.table.target = NULL;