Description of problem:
Running a default installation of OpenShift Ansible Broker will bring up a deployment of the broker with a configmap that has two problems:
1. openshift.namespace is not being set
2. Default imagePullPolicy of APB sandbox is "ifNotPresent"

Problem 1 causes the broker filter secrets work to fail. openshift.namespace should be set to `openshift-ansible-service-broker`. Problem 2 causes the APB development cycle to use stale images when working on a multi-tenant environment. This is because nodes may have an older version of the image when a newer one is pushed to the internal registry.

Version-Release number of the following components:
rpm -q openshift-ansible: master branch
rpm -q ansible: ansible-2.4.3.0-1.fc27.noarch
ansible --version:
ansible 2.4.3.0
  config file = /git/openshift-ansible/ansible.cfg
  configured module search path = [u'/home/dymurray/.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 = 2.7.14 (default, Mar 14 2018, 13:36:31) [GCC 7.3.1 20180303 (Red Hat 7.3.1-5)]


How reproducible:
100%

Steps to Reproduce:
1. Add a valid secret to the broker configmap and redeploy the broker
2. Observe an error in the logs showing the broker looking in namespace "" for the secret.
3. Use `apb push` on a multi-tenant environment and observe APB deployments of stale images

Actual results:
`apb push` doesn't work as intended and broker secret filter functionality is broken after install.

Expected results:
These functions work properly.