Allows to use custom role name for validations

The tripleo-ansible-inventory script uses the role names in order to
group the different hosts.

Since we can use custom roles, the fixed "Controller" and others aren't
relevant in such cases.

Ansible allows to use parameter for the "hosts" value in playbooks,
allowing us to call the validations using this command:

openstack tripleo validator run --validation haproxy \
  --extra-vars '{"controller_rolename": "MyCustomController"}'

(or use the --extra-vars-file in order to avoid in-line JSON)

This patch also correct a non-existent group call, Database. The closest
we have is the "mysql" group in the inventory - let's reflect it in
order to avoid useless warning(s).

Change-Id: I3bec039283fe5df56771d84fff5bd5940fd149d8
(cherry picked from commit ec0465e481)

playbooks/controller-token.yaml

@@ -1,5 +1,7 @@
 ---
-- hosts: undercloud, Controller
+- hosts:
+    - undercloud
+    - "{{ controller_rolename | default('Controller') }}"
   vars:
     metadata:
       name: Verify that keystone admin token is disabled

playbooks/controller-ulimits.yaml

@@ -1,5 +1,5 @@
 ---
-- hosts: Controller
+- hosts: "{{ controller_rolename | default('Controller') }}"
   vars:
     metadata:
       name: Check controller ulimits

playbooks/haproxy.yaml

@@ -1,5 +1,5 @@
 ---
-- hosts: Controller
+- hosts: "{{ controller_rolename | default('Controller') }}"
   vars:
     metadata:
       name: HAProxy configuration

playbooks/mysql-open-files-limit.yaml

@@ -1,5 +1,7 @@
 ---
-- hosts: Controller, Database
+- hosts:
+    - "{{ controller_rolename | default('Controller') }}"
+    - mysql
   vars:
     metadata:
       name: MySQL Open Files Limit

playbooks/neutron-sanity-check.yaml

@@ -1,5 +1,5 @@
 ---
-- hosts: Controller
+- hosts: "{{ controller_rolename | default('Controller') }}"
   gather_facts: false
   vars:
     metadata:

playbooks/nova-event-callback.yaml

@@ -1,5 +1,5 @@
 ---
-- hosts: Controller
+- hosts: "{{ controller_rolename | default('Controller') }}"
   vars:
     metadata:
       name: Nova Event Callback Configuration Check

playbooks/ovs-dpdk-pmd-cpus-check.yaml

@@ -1,5 +1,5 @@
 ---
-- hosts: ComputeOvsDpdk
+- hosts: "{{ compute_ovsdpdk_rolename | default('ComputeOvsDpdk') }}"
   vars:
     metadata:
       name: Validates OVS DPDK PMD cores from all NUMA nodes.

playbooks/pacemaker-status.yaml

@@ -1,5 +1,5 @@
 ---
-- hosts: Controller
+- hosts: "{{ controller_rolename | default('Controller') }}"
   vars:
     metadata:
       name: Check the status of the pacemaker cluster

playbooks/rabbitmq-limits.yaml

@@ -1,5 +1,5 @@
 ---
-- hosts: Controller
+- hosts: "{{ controller_rolename | default('Controller') }}"
   vars:
     metadata:
       name: Rabbitmq limits

playbooks/stonith-exists.yaml

@@ -1,5 +1,5 @@
 ---
-- hosts: Controller
+- hosts: "{{ controller_rolename | default('Controller') }}"
   vars:
     metadata:
       name: Validate stonith devices