BUG/MEDIUM: init: restore behavior of command-line "-m" for memory limitation

The removal for the shared inter-process cache in commit 6fd0450b4
("CLEANUP: shctx: remove the different inter-process locking techniques")
accidentally removed the enforcement of rlimit_memmax_all which
corresponds to what is passed to the command-line "-m" argument.
Let's restore it.

Thanks to @nafets227 for spotting this. This fixes github issue #1319.

src/haproxy.c

@@ -2014,6 +2014,9 @@ static void init(int argc, char **argv)
 		exit(1);
 	}
 
+	if (global.rlimit_memmax_all)
+		global.rlimit_memmax = global.rlimit_memmax_all;
+
 #ifdef USE_NS
         err_code |= netns_init();
         if (err_code & (ERR_ABORT|ERR_FATAL)) {