zhubingbing 9eb9622749 Set tempest image user var
If we don't use cirros image, ``image_ssh_user = cirros`` is wrong,
so we should make it be variable.

Change-Id: I0a1d6999d1dbc8ce319f4bd504455dfd1fb5fceb
Closes-Bug: #1696088
2017-06-07 10:28:38 +08:00
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