sched: disable auto group by default

Autogroup feature is used to improve interactivity for desktop
application. Since our kernel runs on server, just like RHEL8,
disable it by default to avoid unnecessary computing.

More details, please refer https://lwn.net/Articles/416641/Signed-off-by: NShanpei Chen <shanpeic@linux.alibaba.com>
Reviewed-by: NCaspar Zhang <caspar@linux.alibaba.com>

kernel/sched/autogroup.c

@@ -5,7 +5,7 @@
 #include <linux/nospec.h>
 #include "sched.h"
 
-unsigned int __read_mostly sysctl_sched_autogroup_enabled = 1;
+unsigned int __read_mostly sysctl_sched_autogroup_enabled = 0;
 static struct autogroup autogroup_default;
 static atomic_t autogroup_seq_nr;