Import placement auth vars to global scope

Following precedent in the os_nova role[0], nova will use the
placement API credentials to access the placement service. Since
these defaults are used between both the placement and nova roles
they must be scoped in the 'all' group vars.

Change-Id: I25ce79b9e3492cb075c50beed90ea2b78055e474

inventory/group_vars/all/placement.yml

@@ -0,0 +1,20 @@
+---
+# Copyright 2019, Logan Vig <logan2211@gmail.com>
+#
+# 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.
+
+# These vars are used for placement and nova
+placement_service_project_domain_id: default
+placement_service_user_domain_id: default
+placement_service_user_name: placement
+placement_service_project_name: service