Add TripleO validation CLI script

In order to run TripleO validations before any
TripleO deployments, we need a simple cli as entry point
for validations execution.
This review just override the Validation cli
in validations-common by provided TripleO specific
path for validations

Depends-On: https://review.opendev.org/#/c/735973/
Change-Id: Ic6d5ca2445b3285182ba6a1b12939fef4c2b3e61
(cherry picked from commit 95898bff35)

scripts/tripleo-validation.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+
+#   Copyright 2020 Red Hat, Inc.
+#
+#   Licensed under the Apache License, Version 2.0 (the "License"); you may
+#   not use this file except in compliance with the License. You may obtain
+#   a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#   WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#   License for the specific language governing permissions and limitations
+#   under the License.
+
+import logging
+from validations_common.validation import Validation
+
+TRIPLEO_VALIDATION_DIR = "/usr/share/openstack-tripleo-validations"
+
+
+class TripleOValidation(Validation):
+    """TripleO Validation client implementation class"""
+
+    log = logging.getLogger(__name__ + ".TripleOValidation")
+
+    def parser(self, tripleo_parser):
+        """Argument parser for TripleO Validation"""
+        parser = super(TripleOValidation, self).parser(tripleo_parser)
+        # Check if user pass custom path for validation playbooks and
+        # Ansible directory. If not, we override the value with the default
+        # TripleO path.
+        for action in tripleo_parser._actions:
+            if action.dest == 'validation_dir':
+                if action.default == parser.validation_dir:
+                    parser.validation_dir = "{}/playbooks".format(
+                        TRIPLEO_VALIDATION_DIR)
+                if action.dest == 'ansible_base_dir':
+                    if action.default == parser.ansible_base_dir:
+                        parser.ansible_base_dir = TRIPLEO_VALIDATION_DIR
+        return parser
+
+
+if __name__ == "__main__":
+    validation = TripleOValidation()
+    args = validation.parser(validation)
+    validation.take_action(args)