Add groups.yaml containing Validation Groups definition

This file will be the source of reference for all the groups used by
tripleo-Validations. It will be deployed next to the playbooks/roles[1]
in order to parsed by the TripleO Validator CLI and its new
subcommand[2].

It will also be the reference for the tripleo-validations documentation
and will be automated in a follow up patch.

[1] - /usr/share/openstack-tripleo-validations/groups.yaml
[2] - openstack tripleo validator group list

Change-Id: I56b9d39c113cfb30695fe8cf2740ae147b0dd3e4
(cherry picked from commit 6df86cdffe)

groups.yaml

@@ -0,0 +1,34 @@
+---
+no-op:
+  - description: >-
+      Validations which will run a no-op operation to verify that the workflow is
+      working as it supposed to, it will run in both the Undercloud and Overcloud
+      Nodes.
+prep:
+  - description: >-
+      Validations check the hardware configuration of the Undercloud node and
+      should be run before **openstack undercloud install**.
+openshift-on-openstack:
+  - description: >-
+      Validations which will check that the environment meets the requirements
+      to be able to deploy OpenShift on OpenStack.
+pre-introspection:
+  - description: >-
+      Validations which should be run before the nodes introspection using
+      Ironic Inspector.
+pre-deployment:
+  - description: >-
+      Validations which should be executed before **openstack overcloud
+      deploy**.
+post-deployment:
+  - description: >-
+      Validations which should be executed after the Overcloud deployment has
+      finished.
+pre-upgrade:
+  - description: >-
+      Validations which try to validate your OpenStack deployment before you
+      upgrade it.
+post-upgrade:
+  - description: >-
+      Validations which try to validate your OpenStack deployment after you
+      upgrade it.

setup.cfg

@@ -29,6 +29,7 @@ scripts =
 
 data_files =
     share/openstack-tripleo-validations/ = hosts.sample
+    share/openstack-tripleo-validations/ = groups.yaml
     share/openstack-tripleo-validations/roles = roles/*
     share/openstack-tripleo-validations/playbooks = playbooks/*
     share/openstack-tripleo-validations/callback_plugins = callback_plugins/*