create_cluster() failed because network provider is not always set by tests

[Dennis Dmitriev]

If a test case doesn't set network provider, create_cluster() failed with error:

...
 File "/home/jenkins/workspace/8.0.system_test.ubuntu.ceph_ha_one_controller/fuelweb_test/models/fuel_web_client.py", line 442, in create_cluster
    data['net_provider'],
KeyError: 'net_provider'

Reproduced on: https://product-ci.infra.mirantis.net/job/8.0.system_test.ubuntu.ceph_ha_one_controller/14/testReport/%28root%29/ceph_ha_one_controller_compact/ceph_ha_one_controller_compact/

Regression came from https://review.openstack.org/#/c/197628/. Behaviour for network provider will be changed in https://review.openstack.org/#/c/232414/, that will be merged after fixing the bug https://bugs.launchpad.net/fuel/+bug/1503657. So let's not change create_cluster() yet.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/232965

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/232965
Committed: https://git.openstack.org/cgit/stackforge/fuel-qa/commit/?id=55bbc908f77384d78a682352735a0af5f3b6f54c
Submitter: Jenkins
Branch: master

commit 55bbc908f77384d78a682352735a0af5f3b6f54c
Author: Dennis Dmitriev <email address hidden>
Date: Fri Oct 9 11:59:19 2015 +0300

    Network provider is not always set by tests

    create_cluster() logic for network provider will be changed in
     https://review.openstack.org/#/c/232414/, so this is quick fix
    to return old behaviour and get system tests working.

    Change-Id: I1b3efacdd9fb945ddb3c6a5e019f192dbb09d2cc
    Closes-Bug:#1504451