Monkeypatching tagging (#2857)

* Monkeypatching tagging

* taming linter

* did we fix tests?

* no, we don't

Author: deniszh

webapp/graphite/events/models.py

@@ -7,6 +7,8 @@
 import six
 django.utils.encoding.python_2_unicode_compatible = six.python_2_unicode_compatible
 django.utils.six = six
+from django.utils.encoding import smart_str # noqa: E402
+django.utils.encoding.smart_text = smart_str
 from tagging.models import Tag  # noqa: E402
 
 from graphite.events.compat import ModelTaggedItemManager  # noqa: E402