Handle possible keystone duplicated opts
Handle possible keystone duplicated opts

We use trickery to import the keystone middleware options, which might
result in duplicated opts errors. This patch ignore such errors on the
middleware import.

Also use keystonemiddleware instead of keystoneclient.middleware.

Change-Id: I4e003ec9f4a7a706a2bbdeea5f874624fc59ea40

openstack/openstack-doc-tools,openstack/openstack-doc-tools,savinash47/openstack-doc-tools,savinash47/openstack-doc-tools,savinash47/openstack-doc-tools