Use identity_uri instead of auth fragments

auth_token middleware now accepts a standard URL string as the parameter
identity_uri instead of specifying protocol etc individually. Change the
services over to use this.

Also changes over some other places in which the auth fragments are used
individually to the new variables and fixes up some misconfigurations of
auth_token.

identity_uri option was release in keystoneclient 0.8.0

Change-Id: Iac13bc3d08c524a6a0f39cdfbc1009e2f5c45c2a
Merge "Use identity_uri instead of auth fragments"