Correct hard-coded IP ranges

If a baremetal-network is provided in the environment settings
passed to devtest, not all IP ranges are set correctly as some are
hard-coded. This patch makes it so that the environment settings
are used if available.

Relates to: https://review.openstack.org/#/c/85446/

Change-Id: I11ed72a1427f110568f47590a29446d5945b8cbd
Co-Author: matthew.gilliard@hp.com
Merge "Correct hard-coded IP ranges"