Don't save version into the dictionary
Don't save version into the dictionary

By adding version to the dictionary you are getting further away from
the standard token object.

People do use this version property for figuring out what token version
it is so move it to a class property as it should never change anyway.

Change-Id: I3153b364248bf43d445ad2044f0c896efab6e573

citrix-openstack-build/keystoneauth,sileht/keystoneauth,jamielennox/keystoneauth