Fix test classes name of test_tokens.py

These test classes 'UsersTestJSON' and 'UsersTestXML' were introduced
for testing tokens in
  Change-Id: I9a810844b1d991f829f411db308e37a02bd6c09e
But their names are not suitable for their responsibility.
This commit fixes it.

Change-Id: I2bb51fe147c17846d667be6f259f63dcaeffe3fc
1 file changed