Description of problem:
Use 'virsh iface-edit eth0' command to modify eth0 mac address successfully, but 'virsh iface-dumpxml eth0' still display the old mac address while /etc/sysconfig/network-scripts/ifcfg-eth0, augtool, ncftool all display new mac address

Version-Release number of selected component (if applicable):
- netcf-0.1.7-1.el6.x86_64
- netcf-libs-0.1.7-1.el6.x86_64
- libvirt-0.8.7-2.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. # virsh iface-dumpxml eth0
<interface type='ethernet' name='eth0'>
  <mac address='00:21:9b:7d:f9:71'/>
  <protocol family='ipv4'>
    <ip address='10.66.93.146' prefix='23'/>
  </protocol>
  <protocol family='ipv6'>
    <ip address='fe80::221:9bff:fe7d:f971' prefix='64'/>
  </protocol>
</interface>
2. Change eth0 mac address 
# virsh iface-edit eth0
<interface type='ethernet' name='eth0'>
  <start mode='none'/>
  <mac address='00:25:64:a7:1f:4d'/>
  <protocol family='ipv4'>
    <dhcp/>
  </protocol>
</interface>
3. # virsh iface-dumpxml eth0
<interface type='ethernet' name='eth0'>
  <mac address='00:21:9b:7d:f9:71'/>
  <protocol family='ipv4'>
    <ip address='10.66.93.146' prefix='23'/>
  </protocol>
  <protocol family='ipv6'>
    <ip address='fe80::221:9bff:fe7d:f971' prefix='64'/>
  </protocol>
</interface>
4. Double check the modify is really updated by # virsh iface-edit eth0 
5. # cat /etc/sysconfig/network-scripts/ifcfg-eth0 
DEVICE=eth0
HWADDR=00:25:64:a7:1f:4d
ONBOOT=no
BOOTPROTO=dhcp
6. # augtool 
augtool> print /files/etc/sysconfig/network-scripts/ifcfg-eth0/
/files/etc/sysconfig/network-scripts/ifcfg-eth0
/files/etc/sysconfig/network-scripts/ifcfg-eth0/DEVICE = "eth0"
/files/etc/sysconfig/network-scripts/ifcfg-eth0/HWADDR = "00:25:64:a7:1f:4d"
/files/etc/sysconfig/network-scripts/ifcfg-eth0/ONBOOT = "no"
/files/etc/sysconfig/network-scripts/ifcfg-eth0/BOOTPROTO = "dhcp"
augtool> 
7. # ncftool 
ncftool> dumpxml eth0
<?xml version="1.0"?>
<interface type="ethernet" name="eth0">
  <start mode="none"/>
  <mac address="00:25:64:a7:1f:4d"/>
  <protocol family="ipv4">
    <dhcp/>
  </protocol>
</interface>

ncftool> 
8. # service network restart
Shutting down interface eth0:  Device eth0 has MAC address 00:21:9b:7d:f9:71, instead of configured address 00:25:64:a7:1f:4d. Ignoring.
                                                           [FAILED]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:  Device eth0 has different MAC address than expected, ignoring.
                                                           [FAILED]

Actual results:
step3, virsh iface-dumpxml eth0 still display the old mac address

Expected results:
step3, virsh iface-dumpxml eth0 should display the new mac address
step8, in fact, I think it better forbidden modify eth0 mac address. 

Additional info:
So IMHO
1) if it allows to modify eth0 mac address, then virsh iface-dumpxml eth0 should display the new address 
2) or it should not allow to modify eth0 mac address. when it detects the mac address is modified, then fail the edit operation.