Update cinder.conf.sample for new keystone client

The latest version of keystoneclient adds a new conf
entry that we don't have in Cinder.

This patch adds "enforce_token_bind=permissive"

Change-Id: I1aeb6a59ca1787c05075d76dd9d1f96722653d88
(Test commit) Change README to reflect Jio's fork of Cinder

Change-Id: I3f26c0a736e63725aec24ca2fa12c707b8e6460f