Make django_extension commands available if installed.

 - Legacy-Id: 17318

Author: levkowetz

ietf/settings.py

@@ -450,6 +450,12 @@ def skip_unreadable_post(record):
     'ietf.secr.telechat',
 ]
 
+try:
+    import django_extensions            # pyflakes:ignore
+    INSTALLED_APPS.append('django_extensions')
+except ImportError:
+    pass
+
 # Settings for django-bootstrap3
 # See http://django-bootstrap3.readthedocs.org/en/latest/settings.html
 BOOTSTRAP3 = {