Description of problem:

Kuryr's loadbalancer service type support depends on the cloud provider running.
When using Kuryr as sdn solution it is required to have 'openstack' as cloud provider, as described in [1]:

 kubernetesMasterConfig:
   ...
   apiServerArguments:
     cloud-provider:
       - "openstack"
     cloud-config:
       - "/etc/cloud.conf"
   controllerArguments:
     cloud-provider:
       - "openstack"
     cloud-config:
       - "/etc/cloud.conf"


[1] https://docs.openshift.org/latest/install_config/configuring_openstack.html#openstack-configuring-masters-manually

Version-Release number of the following components:

$ rpm -q openshift-ansible
openshift-ansible-3.10.0-0.67.0.git.107.1bd1f01.el7.noarch

$ rpm -q ansible
ansible-2.4.4.0-1.el7ae.noarch

$ ansible --version
ansible 2.4.4.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/home/cloud-user/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.5 (default, Feb 20 2018, 09:19:12) [GCC 4.8.5 20150623 (Red Hat 4.8.5-28)]

How reproducible: 100%

Steps to Reproduce:
1. Deploy OpenStack (OSP13)
2. Deploy a DNS server and the Ansible host in the overcloud
3. Download OCP rpm and configure:
   - OpenStack (inventory/group_vars/all.yml)
       . Configure Kuryr SDN
   - OpenShift (inventory/group_vars/OSEv3.yml)
       . Configure the Red Hat LDAP identity provider
4. Install OpenShift by running the playbooks for OpenStack (deployed 3 masters, 2 infra and 2 app nodes) and verify the installer succeeds without any errors.
5. Check '/etc/origin/master/master-config.yaml' file in master nodes

Actual results:
'/etc/origin/master/master-config.yaml' file does not contain the openstack cloud-provider as in:

 kubernetesMasterConfig:
   ...
   apiServerArguments:
     cloud-provider:
       - "openstack"
     cloud-config:
       - "/etc/cloud.conf"
   controllerArguments:
     cloud-provider:
       - "openstack"
     cloud-config:
       - "/etc/cloud.conf"

Expected results:
openstack cloud-provider should be configured