Configurable token hashing
Configurable token hashing

Provide an option for operator to turn off token
hashing to be performed by horizon.

In some deployment where PKI token format is used
for keystone, token hashing causes issue and results
to 401 error in horizon.

Change-Id: I187b1486db2e453fd49298e1478e30abe97e54fe
Closes-Bug: #1473588

redhat-openstack/django_openstack_auth,redhat-openstack/django_openstack_auth,dan1/django_openstack_auth_proto,dan1/django_openstack_auth_proto