Description of problem:
virt-manager fails to connect to a qemu-kvm guest's VNC display if the listen address is set to [::].  virt-viewer does connect.  virt-manager does connect successfully if the address is 0.0.0.0. 

Version-Release number of selected component (if applicable):
0.9.5

How reproducible:
Always

Steps to Reproduce:
1. Start libvirtd with vnc_listen="::" in /etc/libvirt/qemu.conf.
2. Connect virt-manager to qemu+tcp://hostname/system and create a guest with a VNC display.
3. Try to open the guest's display from virt-manager.

Actual results:
virt-manager fails to show the guest's display, instead producing the error message "viewer connection to hypervisor host got refused or disconnected"

Expected results:
virt-manager should show the guest's VNC display.

Additional info:
/usr/share/virt-manager/virtManager/console.py defines the function get_conn_host().  Within that function is a condition:

  if self.gaddr != "0.0.0.0":

Changing the line to the following allows virt-manager to connect properly:

  if self.gaddr != "0.0.0.0" and self.gaddr != "::":

The same python script contains the hardcoded 127.0.0.1 address in various places.  I have not tested but they may also cause trouble with the IPv6 loopback address [::1].  I have also not tested configuring the VNC server to bind to a specific IPv6 address.