MAJOR: config: remove the deprecated reqsetbe / reqisetbe actions

These ones were already obsoleted in 1.4, marked for removal in 1.5,
and not documented anymore. They used to emit warnings, and do still
require quite some code to stay in place. Let's remove them now.
diff --git a/src/haproxy.c b/src/haproxy.c
index 353ff8a..1b77475 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -1220,8 +1220,7 @@
 				free(exp->preg);
 			}
 
-			if (exp->replace && exp->action != ACT_SETBE)
-				free((char *)exp->replace);
+			free((char *)exp->replace);
 			expb = exp;
 			exp = exp->next;
 			free(expb);
@@ -1233,8 +1232,7 @@
 				free(exp->preg);
 			}
 
-			if (exp->replace && exp->action != ACT_SETBE)
-				free((char *)exp->replace);
+			free((char *)exp->replace);
 			expb = exp;
 			exp = exp->next;
 			free(expb);