Add base CollectionArchivator class

This class required for archivation and restore groups of archivators.
You can set up extra_pre_restore_check, extra_backup and extra_restore
action. This actions will runn after base_actions of classes setting up
in archivator_classes.

Usage:

class SimpleCollectionArchivator(CollectionArchivator):

    archivator_classes = [Archivator1, Archivator2, Archivator3]

Change-Id: Ie534ffd5c06abd48837f84dfb495410dbf5afa61
(cherry picked from commit 3636aa3793)

octane/handlers/backup_restore/base.py

@@ -135,3 +135,25 @@ class PathArchivator(Base):
                 member.name = member.name.split("/", 1)[-1]
                 path = self.path
             self.archive.extract(member, path)
+
+
+class CollectionArchivator(Base):
+
+    archivators_classes = []
+
+    def __init__(self, *args, **kwargs):
+        super(CollectionArchivator, self).__init__(*args, **kwargs)
+        self.archivators = [c(*args, **kwargs)
+                            for c in self.archivators_classes]
+
+    def backup(self):
+        for archvator in self.archivators:
+            archvator.backup()
+
+    def restore(self):
+        for archvator in self.archivators:
+            archvator.restore()
+
+    def pre_restore_check(self):
+        for archvator in self.archivators:
+            archvator.pre_restore_check()

octane/tests/test_base_collection_archivator.py

@@ -0,0 +1,33 @@
+# 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 mock
+import pytest
+
+from octane.handlers.backup_restore import base
+
+
+@pytest.mark.parametrize("action", ["backup", "restore", "pre_restore_check"])
+@pytest.mark.parametrize("archivators", [[mock.Mock(), mock.Mock()], []])
+def test_collection_archivator(action, archivators):
+
+    class TestCollectionArchivator(base.CollectionArchivator):
+
+        archivators_classes = archivators
+
+    archive = mock.Mock()
+    context = mock.Mock()
+
+    getattr(TestCollectionArchivator(archive, context), action)()
+
+    for archivator in archivators:
+        getattr(archivator.return_value, action).assert_called_once_with()