rm hardcoded cidr in test_create_server_multi_nic

Now, We have some hard code in here, but some VPC are limited to
some specific address ranges by default in some cloud.

So, we need change these hard code to configuration, it can
meet the user specific requirement flexibly and reasonably.

closes-bug: #1743742
Signed-off-by: Pragadeeswaran Sathyanarayanan <psathyan@redhat.com>
Change-Id: Ia201c0520b8d2df17664b84bd61755d7c2d68258
1 file changed