Add Ubuntu Bionic 18.04 support

Change-Id: I40af74537c41260323961a278c17fe58350a34b5

vars/ubuntu-18.04.yml

@@ -0,0 +1,31 @@
+---
+# Copyright 2018, VEXXHOST, 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.
+
+## APT Cache options
+cache_timeout: 600
+
+tempest_distro_packages:
+  - git-core
+  - libpq-dev
+  - python-glanceclient
+  - python-keystoneclient
+  - python-neutronclient
+  - python-novaclient
+  - rsync
+
+tempest_requires_pip_packages:
+  - shade # ubuntu xenial provides a rather old shade library. We need >= 1.9.0 for Rocky
+  - virtualenv
+  - setuptools # Ubuntu's setuptools package does not contain pkg-resources and that's causing troubles