Description of problem:


Version-Release number of selected component (if applicable):
libvirt-0.8.1-27.el6_0.5.x86_64
qemu-kvm-0.12.1.2-2.113.el6_0.8.x86_64
kernel-2.6.32-71.20.1.el6.x86_64


How reproducible:
always

Steps to Reproduce:
[read/write mode]
Failed to deal with '' when there is space in guest's name 
# virsh list --all
 Id Name                 State
----------------------------------
  9 local                running
  - a b                  shut off
  - ayal                 shut off


# virsh dommemstat 'local'

# virsh dommemstat 'ayal'
error: Failed to get memory statistics for domain ayal
error: Requested operation is not valid: domain is not running

# virsh dommemstat 'a b'
error: unexpected data 'b'

[readonly mode]
# virsh -r
Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
       'quit' to quit

virsh > dommemstat 'a b'
error: unexpected data 'b''  ----> one more ' displayed
virsh > dommemstat 'ayal'
error: failed to get domain ''ayal''  ---> a pair more '' displayed 
error: Domain not found: no domain with matching name ''ayal'' ---> a pair more '' displayed 

virsh > dommemstat ayal
error: Failed to get memory statistics for domain ayal
error: Requested operation is not valid: domain is not running

virsh > dommemstat a b
error: unexpected data 'b'

virsh > dommemstat local



Actual results:
Failures are :
1. '' are handled differently between R/W and RO mode 
2. on R/W mode, failed to recognize the guest name if there is space in the name
3. on RO mode , failed to recognize the guest name if there is space in the name,also , messed up '''' displayed . 

Expected results:
Could deal with '' correctly . And make R/W and RO mode consistent . 

Additional info:
on RHEL6.1 , there is no such problem