Description of problem:

My test_config.json file has a undercloud_stackrc key but it's ignored by 
[stack@director ~]$ cat /etc/redhat-certification-openstack/test_config.json
{
  "keystone_auth_url" : "http://192.168.190.37:5000/v2.0",
  "keystone_region_name": "regionOne",
  "admin_username": "admin",
  "admin_password": "fKy8tmezmp8BwG4yZrTHs33EV",
  "admin_tenant_name": "admin",
  "plugin_type": "blockstorage",
  "supported_apis_and_extensions": ["volumes","snapshots","volume_types","qos","quota-set-extension","multiple-backends","availability","extensions","volume_transfers"],
  "lbaas_api_version": "v2",
  "undercloud_stackrc": "/home/stack/stackrc"
}
[stack@director ~]$ sudo rhcert-ci run --key-file /home/stack/key.file --debug high
(...)
installing test from /usr/lib/python2.7/site-packages/rhcert/suites/openstack_cert into /var/log/rhcert/runs/1/openstack/director
HardwareTestHarness.runTest:
directory /var/log/rhcert/runs/1/openstack/director    parameters: 
setting testserver to IP 127.0.0.1
Test Parameters: outputfile=/var/log/rhcert/runs/1/openstack/director/output.log testserver=127.0.0.1 
Checking installed rpms:
python-oslo-config-3.17.0-1.1.el7ost.noarch
python-oslo-config-3.17.0-1.1.el7ost.noarch
python-heatclient-1.5.0-1.el7ost.noarch
python-oslo-cache-1.14.0-1.1.el7ost.noarch
python-zaqarclient-1.2.0-2.el7ost.noarch
All required packages installed
Please input the path to undercloud stackrc file:  <------- Client is frozen waiting for an user input


Version-Release number of selected component (if applicable):

redhat-certification-openstack-4.3-20161220.el7.noarch
redhat-certification-backend-4.3-20161220.el7.noarch
redhat-certification-4.3-20161220.el7.noarch

Expected results:

rhcert-ci should not freeze. It would be nice if it could use a sensible default value like /home/stack/stackrc.