Update the keystone configuration script for Barbican per Johns Hopkins team.

The Johns Hopkins team has been working to integrate Barbican in to their
encryption key management work flows. Hadi A. Esiely Barrera provided modifications
that were needed to the Barbican Keystone configuration script to make it
function correctly. This change request also restores the barbican-all script
as teams such as Johns Hopkins are utilizing it.

Change-Id: I764bd1606a0f8124660651104eb0dd58e82b9f6f