Description of problem:
Add a new connection to remote Xen hypervisor in virt-manager

Version-Release number of selected component (if applicable):
virt-manager.noarch 0.8.7-6.fc15

How reproducible:
Always

Steps to Reproduce:
1. Add new connection to a remote Xen hypervisor using ssh
2. Try to connect to it
  
Actual results:
"Unable to open a connection to the libvirt mamangement daemon
 Libvirt URI is: xen+ssh://user.org/"

cannot recv data: ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory

Host key verification failed.

: Connexion ré-initialisée par le correspondant

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/connection.py", line 1055, in _try_open
    None], flags)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 107, in openAuth
    if ret is None:raise libvirtError('virConnectOpenAuth() failed')
libvirtError: cannot recv data: ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory

Host key verification failed.

: Connexion ré-initialisée par le correspondant

Expected results:


Additional info:
"ls /usr/libexec/openssh/ssh-askpass" return no such file or directory