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Description
virt-manager can't establish ssh remote connection to xen hypervisor

Version:
virt-manager-1.2.0-2.el7.noarch

How reproducible:
100%

Steps to Reproduce:
1.Launch virt-manager: #virt-manager.
2.Connect to a remote xen host
  ("File ->Add Connection ->Choose Xen for Hypervisor -> Click "connect to remote host"
  --> choose 'SSH' --> Input the hostname (eg:10.66.106.64)-->Click 'Connect'")
3.Input the password and wait for connection.

Actual Results:
Can't establish connection, error message:

Error polling connection 'xen+ssh://root.106.64/': 0

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/engine.py", line 343, in _handle_tick_queue
    conn.tick_from_engine(**kwargs)
  File "/usr/share/virt-manager/virtManager/connection.py", line 1266, in tick_from_engine
    raise e  # pylint: disable=raising-bad-type
KeyError: 0

Expected Results:
Connected to remote xen machine successfully

Additional info:
Can establish connection on virt-manager 1.1.0-12.el7

*** This bug has been marked as a duplicate of bug 1219629 ***