Merge branch 'release_3.1.3' into devel

* release_3.1.3: (52 commits)
  ack fact scan messages
  making ldap user/group search fields into codemirror instances
  removing UI parsing for LDAP User and Group Search fields
  Allow exception view to accept all valid HTTP methods.
  Restore ability of parsing extra_vars string for provisioning callback.
  Fix up backup/restore role broken in f7a8e45809758322d9ee41c5305850dd70ed5faf
  Stop / start ansible-tower-service during restores
  value_to_python should encode lookup fields as ascii
  fix brace interpolation on standard out pane
  Adjust some hardcoded usages of 'awx' to use 'aw_user' and 'aw_group'.
  Pull Spanish updates from Zanata
  Temporarily grant awx user createdb role
  Stop giving ownership of backups to postgres
  don't display chunked lines'
  Add dropdown li truncation with ellipsis
  CTiT -> adhoc modules should allow the user to add new modules
  Remove task that was replacing the supervisor systemd tmp file
  Fix failing supervisorctl commands on RH-based distros
  Give ownership of the supervisor socket to awx
  Setting for external log emissions cert verification
  ...

awx/sso/backends.py

@@ -12,7 +12,6 @@ from django.dispatch import receiver
 from django.contrib.auth.models import User
 from django.conf import settings as django_settings
 from django.core.signals import setting_changed
-from django.core.exceptions import ImproperlyConfigured
 
 # django-auth-ldap
 from django_auth_ldap.backend import LDAPSettings as BaseLDAPSettings
@@ -93,8 +92,8 @@ class LDAPBackend(BaseLDAPBackend):
             return None
         try:
             return super(LDAPBackend, self).authenticate(username, password)
-        except ImproperlyConfigured:
-            logger.error("Unable to authenticate, LDAP is improperly configured")
+        except Exception:
+            logger.exception("Encountered an error authenticating to LDAP")
             return None
 
     def get_user(self, user_id):