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
diff --git a/releasenotes/notes/remove-deprecated-old-token-clients-e4c2e654132f1130.yaml b/releasenotes/notes/remove-deprecated-old-token-clients-e4c2e654132f1130.yaml
new file mode 100644
index 0000000..9acb873
--- /dev/null
+++ b/releasenotes/notes/remove-deprecated-old-token-clients-e4c2e654132f1130.yaml
@@ -0,0 +1,9 @@
+---
+prelude: >
+    Tempest's identity service client TokenClientJSON and V3TokenClientJSON
+    has been removed.
+upgrade:
+  - |
+    Tempest's identity service client TokenClientJSON and V3TokenClientJSON
+    were deprecated since long which are not removed. Please use new service
+    clients TokenClient and V3TokenClient instead.