init

hulk inclusion
category: feature
bugzilla: 48159
CVE: N/A

------------------------------

We record the pid of dump tasks in the reserved memory,
and reserve the pids before init task start.
In the recover process, free the reserved pids and
realloc them by setting fork_pid.

Signed-off-by: Jingxian He <hejingxian@huawei.com>
Reviewed-by: Jing Xiangfeng <jingxiangfeng@huawei.com>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>