Hongbin Lu 4d16326bb9 Rename virt driver from 'docker' to 'zun'
The rationals are as following:
* Make it clear that the in-tree virt driver is not the same as the
  nova-docker driver
* Justify that Zun is going to support additional runtime
* Avoid name collision with nova-docker on packaging.

Change-Id: I08f9cc0100837f62c57e2e77cd7f6cd727b91b69
Closes-Bug: #1652387
2016-12-24 15:50:52 -06:00
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