Remove old deprecated Token clients

TokenClientJSON and V3TokenClientJSON were deprecated
very long back so its time to remove them.

No one in OpenStack using those
- https://codesearch.opendev.org/?q=TokenClientJSON&i=nope&files=&excludeFiles=&repos=

Change-Id: If20fa58e64e130e268e1ad7999b0088a0a0c0f9c
3 files changed