Add tests for new data-driven upgrade procedure

The upgrade procedure was completely changed because
of changing base OS for Fuel (Centos7). It leads to
complete refactoring of all upgrade-related code
including tests

This commit should be backportable to 7.0 branch
because we need to prepare some 7.0 clusters.
This is the reason of rejecting SSHManager
 _for this commit_. It will be integrated later.

Change-Id: I1932c28beb9a7101019a02d4cd5245a1a0996a05
Partial-bug:1546943

doc/base_tests.rst

@@ -616,6 +616,11 @@ Restart tests
 Upgrade tests
 =============
 
+Test Data-Driven Upgrade
+------------------------
+.. automodule:: fuelweb_test.tests.tests_upgrade.test_data_driven_upgrade
+   :members:
+
 OS upgrade tests
 ================
 

fuelweb_test/settings.py

@@ -492,6 +492,11 @@ FUEL_PLUGIN_BUILDER_REPO = 'https://github.com/openstack/fuel-plugins.git'
 # Ubuntu: http://osci-obs.vm.mirantis.net:82/ubuntu-fuel-master-20921/ubuntu/
 CUSTOM_PKGS_MIRROR = os.environ.get('CUSTOM_PKGS_MIRROR', '')
 
+# URL for Fuel proposed repository - required for correct ordering of upgrade:
+# update Fuel Master node using published packages (UPDATE_FUEL=True)
+# then attach the repository in the test case.
+FUEL_PROPOSED_REPO_URL = os.environ.get('FUEL_PROPOSED_REPO_URL', '')
+
 # Location of local mirrors on master node.
 LOCAL_MIRROR_UBUNTU = os.environ.get('LOCAL_MIRROR_UBUNTU',
                                      '/var/www/nailgun/ubuntu/x86_64')