virsh: Make 'exit' action same as 'quit'
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 <238d8cde7f155cab998fb7d3bca21ace45b10710@cn.fujitsu.com>

agx/libvirt,shugaoye/libvirt,libvirt/libvirt,libvirt/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,andreabolognani/libvirt,crobinso/libvirt,elmarco/libvirt,taget/libvirt,jardasgit/libvirt,zippy2/libvirt,rlaager/libvirt,jardasgit/libvirt,olafhering/libvirt,datto/libvirt,rlaager/libvirt,libvirt/libvirt,crobinso/libvirt,taget/libvirt,fabianfreyer/libvirt,agx/libvirt,taget/libvirt,rlaager/libvirt,crobinso/libvirt,elmarco/libvirt,nertpinx/libvirt,shugaoye/libvirt,elmarco/libvirt,VenkatDatta/libvirt,eskultety/libvirt,eskultety/libvirt,andreabolognani/libvirt,shugaoye/libvirt,elmarco/libvirt,eskultety/libvirt,datto/libvirt,shugaoye/libvirt,crobinso/libvirt,nertpinx/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,datto/libvirt,fabianfreyer/libvirt,datto/libvirt,libvirt/libvirt,olafhering/libvirt,agx/libvirt,nertpinx/libvirt,eskultety/libvirt,eskultety/libvirt,jardasgit/libvirt,jfehlig/libvirt,agx/libvirt,taget/libvirt,olafhering/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,datto/libvirt,zippy2/libvirt,andreabolognani/libvirt,rlaager/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,olafhering/libvirt,rlaager/libvirt,zippy2/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,taget/libvirt,jfehlig/libvirt,agx/libvirt,zippy2/libvirt,elmarco/libvirt