Import all helpful types in prod settings template

All of these types may potentially be used by users of this settings
template, so it's handy to add them in. This avoids missing import
errors later.

This is an especially helpful change for the Zulip docker image, where
importing extra types is a bit annoying.

Fixes zulip/docker-zulip#252

zproject/prod_settings_template.py

@@ -167,7 +167,23 @@
 ## optionally using LDAP as an authentication mechanism.
 
 import ldap
-from django_auth_ldap.config import GroupOfNamesType, LDAPGroupQuery, LDAPSearch  # noqa: F401
+from django_auth_ldap.config import (
+    LDAPSearch,
+    LDAPSearchUnion
+    LDAPGroupQuery,
+    LDAPGroupType,
+    PosixGroupType,
+    MemberDNGroupType,
+    NestedMemberDNGroupType,
+    GroupOfNamesType,
+    NestedGroupOfNamesType,
+    GroupOfUniqueNamesType,
+    NestedGroupOfUniqueNamesType,
+    ActiveDirectoryGroupType,
+    NestedActiveDirectoryGroupType,
+    OrganizationalRoleGroupType,
+    NestedOrganizationalRoleGroupType,
+) # noqa: F401
 
 ## Connecting to the LDAP server.
 ##