InvalidHostForRebuildNotEnoughVIOS mock needs additional param
InvalidHostForRebuildNotEnoughVIOS mock needs additional param

The exception being raised as a side effect in a mock now needs
to take a parameter. We'll get an error if the replacement
value is not given.

Change-Id: I6b63a625331772e39a6921cda6eb487193f12dce
Closes-Bug: #1583627

openstack/nova-powervm,openstack/nova-powervm,stackforge/nova-powervm,stackforge/nova-powervm