Bug 1509476

Description of problem:
When provisioning a MariaDB APB but leaving passwords blank, password generation fails and provision subsquently fails.

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


How reproducible:
100%

Steps to Reproduce:
1. Log in to console
2. Provision MariaDB APB
3. Leave (root or user) passwords blank

Actual results:
Provision fails with an error

Expected results:
Provision is successful

Additional info:
Sandbox log:

+ [[ provision --extra-vars {"_apb_plan_id":"dev","_apb_service_class_id":"14279bd3c56924e5c97c20b965e74f26","_apb_service_instance_id":"8c62def0-7dbe-4f4c-a2a6-e3eff33de9ed","mariadb_version":"10.0","mysql_database":"admin","mysql_root_password":"admin","mysql_user":"admin","namespace":"maria6"} == *\s\2\i\/\a\s\s\e\m\b\l\e* ]]
+ ACTION=provision
+ shift
+ playbooks=/opt/apb/actions
+ CREDS=/var/tmp/bind-creds
+ TEST_RESULT=/var/tmp/test-result
+ whoami
+ '[' -w /etc/passwd ']'
++ id -u
+ echo 'apb:x:1000300000:0:apb user:/opt/apb:/sbin/nologin'
+ oc-login.sh
Attempting to login with a service account...
Logged into "https://kubernetes.default:443 " as "system:serviceaccount:dh-rhscl-mariadb-apb-prov-mpdt6:apb-6b92a63f-bd66-42b7-aeed-440bf7b6f47b" using the token provided.
You have access to the following projects and can switch between them with 'oc project <projectname>':
  * dh-rhscl-mariadb-apb-prov-mpdt6
    maria6
Using project "dh-rhscl-mariadb-apb-prov-mpdt6".
Welcome! See 'oc help' to get started.
+ set +x
ls: cannot access /etc/apb-secrets: No such file or directory
+ [[ -e /opt/apb/actions/provision.yaml ]]
+ [[ -e /opt/apb/actions/provision.yml ]]
+ ANSIBLE_ROLES_PATH=/etc/ansible/roles:/opt/ansible/roles
+ ansible-playbook /opt/apb/actions/provision.yml --extra-vars '{"_apb_plan_id":"dev","_apb_service_class_id":"14279bd3c56924e5c97c20b965e74f26","_apb_service_instance_id":"8c62def0-7dbe-4f4c-a2a6-e3eff33de9ed","mariadb_version":"10.0","mysql_database":"admin","mysql_root_password":"admin","mysql_user":"admin","namespace":"maria6"}'
 [WARNING]: Could not match supplied host pattern, ignoring: all
 [WARNING]: provided hosts list is empty, only localhost is available
[DEPRECATION WARNING]: The use of 'include' for tasks has been deprecated. Use 
'import_tasks' for static inclusions or 'include_tasks' for dynamic inclusions.
 This feature will be removed in a future release. Deprecation warnings can be 
disabled by setting deprecation_warnings=False in ansible.cfg.
[DEPRECATION WARNING]: include is kept for backwards compatibility but usage is
 discouraged. The module documentation details page may explain more about this
 rationale.. This feature will be removed in a future release. Deprecation 
warnings can be disabled by setting deprecation_warnings=False in ansible.cfg.
PLAY [Deploy rhscl-mariadb-apb to openshift] ***********************************
TASK [ansible.kubernetes-modules : Install latest openshift client] ************
skipping: [localhost]
TASK [ansibleplaybookbundle.asb-modules : debug] *******************************
skipping: [localhost]
TASK [rhscl-mariadb-apb-openshift : set mariadb deployment using persistent storage to present] ***
changed: [localhost]
TASK [rhscl-mariadb-apb-openshift : set volume claim state to present] *********
skipping: [localhost]
TASK [rhscl-mariadb-apb-openshift : set mariadb deployment using persistent storage to present] ***
skipping: [localhost]
TASK [rhscl-mariadb-apb-openshift : set rhscl-mariadb service state to present] ***
changed: [localhost]
TASK [rhscl-mariadb-apb-openshift : encode bind credentials] *******************
fatal: [localhost]: FAILED! => {"failed": true, "msg": "{{ lookup('mysql_password', '/tmp/pass chars=ascii_letters,digits') }}: lookup plugin (mysql_password) not found"}
	to retry, use: --limit @/opt/apb/actions/provision.retry
PLAY RECAP *********************************************************************
localhost                  : ok=2    changed=2    unreachable=0    failed=1   
+ EXIT_CODE=2
+ set +ex
+ '[' -f /var/tmp/test-result ']'
+ '[' -f /var/tmp/bind-creds ']'
+ exit 2