Merge pull request #73 from akosiaris/master

Remove all occurences of servermon package in imports
Make S/N search in jira plugin configurable

* search_string is now specified in settings.py
* closes #74
Merge pull request #75 from rowanthorpe/make-jira-search-term-configurable

Make S/N search in jira plugin configurable
actually honor change_equipment permission

The change_equipment was not honored if given to a user and that user
was not also a superuser. Fix this by modifying the admin overrides in
hwdoc's EquipmentAdmin to check for change_equipment instead of
superuser. Add tests as well for the above
Thos solves #77