Pass os_endpoint to keystone session

The os_endpoint should be passed to the keystone session as the
endpoint_override argument.

This is particularly imprtant for talking to Rackspace, who seem to
have an odd situation where the endpoint is V2 compatible [1], but the
API is still at /v1/ [2] (i think?).

To use the RAX API you need to find your account number, then
something like:

 OS_USERNAME=xyz
 OS_PASSWORD=abc
 OS_AUTH_URL=https://identity.api.rackspacecloud.com/v2.0/
 OS_VOLUME_API_VERSION=2
 CINDER_ENDPOINT=https://dfw.blockstorage.api.rackspacecloud.com/v1/<account#>
 cinder volume list

Should work

Honestly I'm not 100% what's up with the unit test.  I think endpoint
override was not being processed previously, and now it is so it drops
the "admin"?

Story: #2007459
Task: #39138

[1] https://developer.rackspace.com/docs/cloud-block-storage/v1/general-api-info/cbsv1-methods-vs-cinderv2-methods/
[2] https://developer.rackspace.com/docs/cloud-block-storage/v1/general-api-info/service-access/

Change-Id: I6b9a1f088c84676ddf9894cf9524d3239f3cf3a9

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