virsh: Make 'exit' action same as 'quit'

For now 'virsh quit' action like this:
--------------------------------
[root@localhost /]# virsh quit
[root@localhost /]#
--------------------------------
And 'virsh exit' action:
--------------------------------
[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: Li Yang <liyang.fnst@cn.fujitsu.com>

tools/virsh.c

@@ -1852,7 +1852,8 @@ vshCommandRun(vshControl *ctl, const vshCmd *cmd)
         if (!ret && disconnected != 0)
             vshReconnect(ctl);
 
-        if (STREQ(cmd->def->name, "quit"))        /* hack ... */
+        if (STREQ(cmd->def->name, "quit") ||
+            STREQ(cmd->def->name, "exit"))        /* hack ... */
             return ret;
 
         if (enable_timing) {