fixes issue_hierarchy tests

* need to set Setting.cross_project_issue_relations as core now enforces it

spec/models/issue_hierarchy_restriction_project_boundaries_spec.rb

@@ -92,6 +92,16 @@ describe Issue, 'parent-child relationships between backlogs stories and backlog
                               :author => user,
                               :priority => issue_priority) }
 
+  before(:all) do
+    @are_settings_cached = Setting.use_caching?
+    Setting.use_caching = false
+    Setting.cross_project_issue_relations = "1"
+  end
+
+  after(:all) do
+    Setting.use_caching = @are_settings_cached
+  end
+
   before(:each) do
     parent_project.save!
     child_project.save!