- support multiple parallel maintenance workflows

for the same projects. So do not use project "maintains", but the
attribute to be able to switch between maintenance, security and PTF
working contexts for example.

osc/core.py

@@ -3956,7 +3956,7 @@ def create_submit_request(apiurl,
             print("WARNING:")
             print("WARNING: Project does not accept submit request, request to open a NEW maintenance incident instead")
             print("WARNING:")
-            xpath = 'maintenance/maintains/@project = \'%s\'' % dst_project
+            xpath = 'attribute/@name = \'%s\'' % conf.config['maintenance_attribute']
             res = search(apiurl, project_id=xpath)
             root = res['project_id']
             project = root.find('project')