Add Gentoo support to os_tempest

Change-Id: If241d2037e5640796e5ebbc9a6eb03fc552a2ea3

vars/gentoo.yml

@@ -0,0 +1,25 @@
+---
+# Copyright 2019, Matthew Thode
+#
+# 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.
+
+tempest_distro_packages:
+  - dev-vcs/git
+  - dev-libs/libxslt     # required by the python module unittest2
+
+tempest_service_distro_packages:
+  - tempest
+  - dev-python/junit-xml
+  - dev-python/subunit
+
+tempest_plugin_distro_packages: []