Fix qemu pause bug:

	When typing pause command in the zvm, system may excete to a
null pointer address. The reason is that the schduler marks the thread as
a queued thread in the running qeueu, but  dose not add it to the real
queue which make a illegal access.
signed-off-by: Chenglai <Xiong&lt;xiongcl@hnu.edu.cn>