For now 'virsh quit' action like this:
--------------------------------
[root@localhost /]# virsh quit
[root@localhost /]#
--------------------------------
And 'virsh exit' action:
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[root@localhost /]# virsh exit

[root@localhost /]#
--------------------------------
There is a small difference('/n') between them.
According to manual said:
       quit, exit
           quit this interactive terminal

And in the code they all called cmdQuit func,
They should get same actions.
Signed-off-by: NLi Yang <liyang.fnst@cn.fujitsu.com>