feat: 支持setns接口

BREAKING CHANGE:
支持setns接口对外变更:
1.新增setns接口

Close #I6D9Y0

Signed-off-by: zhushengle <zhushengle@huawei.com>
Change-Id: I9aacf9e5b8463e8e6c743a0041a5b2b18fdb0e12

syscall/los_syscall.h

@@ -86,6 +86,7 @@ extern int SysFork(void);
 extern int SysVfork(void);
 extern int SysClone(int flags, void *stack, int *parentTid, unsigned long tls, int *childTid);
 extern int SysUnshare(int flags);
+extern int SysSetns(int fd, int type);
 extern unsigned int SysGetPID(void);
 extern unsigned int SysGetPPID(void);
 extern int SysSetGroupID(unsigned int gid);