LDAP: document enabled_emulation

 - Add documentation to the Configuration page for enabled_emulation
 - Fix a comment about the default value used for enabled_emulation

Change-Id: I3fdb4e9ecfe8bd43f8046d6e99a18941bc938487
Closes-Bug: #1275907
List trusts, incorrect self link.

Fix the base_url method in trust controller to build off
of the one in V3 controller.

Closes-Bug: #1279398

Change-Id: If9b3114c9b2b9978237988fa3b52e0bede783057
Set sensible default for keystone's paste

The https://review.openstack.org/#/c/66247/ change introduced
the requirement to set config_file before keystone would start
up. Restore the old setting as default to allow a smooth
transition for users.

Change-Id: I935c5144728d04c59abaee9a515e249ef0d24477
Merge "Set sensible default for keystone's paste"
Merge "LDAP: document enabled_emulation"
Merge "List trusts, incorrect self link."