【内核子系统集成测试】修改不稳定用例：shared_memory 模块ShmTest.cpp用例ShmTest.testShmatSHM_REMAP 未按照预想逻辑运行问题。

Signed-off-by: Ngao_harmony <gaofeng44@huawei.com>
Change-Id: I21db9d82c0d1967e9d59d48114e7bc5e3c9907e8

kernel_lite/ipc_posix/shared_memory/ShmTest.cpp

@@ -206,7 +206,7 @@ HWTEST_F(ShmTest, testShmatSHM_REMAP, Function | MediumTest | Level1)
     ASSERT_NE(shared, (void*)-1) << "> parent: shmat 2 : errno = " << errno;
     strncpy(shared, SHM_TEST_STR, SHM_TEST_STR_LEN);
     ASSERT_NE(shmdt(shared), -1) << "> parent: shmdt 2 : errno = " << errno;
-    Msleep(20);
+    Msleep(50);
     ASSERT_NE(shmctl(shmid, IPC_RMID, nullptr), -1) << "> parent: shmctl : errno = " << errno;
 
     Msleep(50);