Description of problem:

'virsh list' should output more information 'xm list'.
It is very useful for administrators to quick detect where is the problem.


Expected results:

1. the amount of memory used by guest, and maxmem
2. vcpu count
3. uptime of guest
4. More Info such as CPU usage and IOPS of block devices.

for example:
Id Name       State        Memory   VCPU     Uptime    CPU   IOPS
---------------------------------- 
  1 bbs       idle         768M      2       3hours     5%   12.1
  2 bbs2      idle         768M      4      10hours    12%    0.3

5. add an option to find out autostart enabled guests.

Thanks