Move installation steps to YAML filex

- move installation steps to YAML files
- add fixtures and snapshots for install salt, common services
  and openstack
- fixtures in conftest.py now are included by python instead of
  using pytest plugins
diff --git a/tcp_tests/managers/openstack_manager.py b/tcp_tests/managers/openstack_manager.py
new file mode 100644
index 0000000..9727ac4
--- /dev/null
+++ b/tcp_tests/managers/openstack_manager.py
@@ -0,0 +1,28 @@
+#    Copyright 2016 Mirantis, 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.
+
+class OpenstackManager(object):
+    """docstring for OpenstackManager"""
+
+    __config = None
+    __underlay = None
+
+    def __init__(self, config, underlay):
+        self.__config = config
+        self.__underlay = underlay
+        super(OpenstackManager, self).__init__()
+
+    def install(self, commands):
+        self.__underlay.execute_commands(commands)
+        self.__config.openstack.installed = True