test_upgrade_common: add mock for get_package_version

Fixes regression introduced by ceph#891

Signed-off-by: Jan Fajerski <jfajerski@suse.com>
(cherry picked from commit c84bde3)

teuthology/test/task/test_install.py

@@ -122,13 +122,15 @@ def test_upgrade_is_downgrade(self):
 	for t in assert_ok_vals:
             assert install._upgrade_is_downgrade(t[0], t[1]) == False
 
+    @patch("teuthology.packaging.get_package_version")
     @patch("teuthology.misc.get_system_type")
     @patch("teuthology.task.install.verify_package_version")
     @patch("teuthology.task.install.get_upgrade_version")
     def test_upgrade_common(self,
                             m_get_upgrade_version,
                             m_verify_package_version,
-                            m_get_system_type):
+                            m_get_system_type,
+                            m_get_package_version):
         expected_system_type = 'deb'
         def make_remote():
             remote = Mock()
@@ -169,6 +171,7 @@ def only(self, role):
             ],
         }
 	m_get_upgrade_version.return_value = "11.0.0"
+        m_get_package_version.return_value = "10.2.4"
         m_get_system_type.return_value = "deb"
         def upgrade(ctx, node, remote, pkgs, system_type):
             assert system_type == expected_system_type