Jacob Wagner f57ef996a2 Allow tempest network overrides for public and private net
Added default variables to allow for individual overrides of
the public and private networks that will be created. This required
seperate blocks for different net types.

Change-Id: I177a41fc8134cb916de38989c1a702028633fa06
Closes-bug: 1580292
2016-05-18 11:36:00 -05:00
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