All service clients' name should not contain "JSON" because of
Ic6d4c340e145a18cd45bc6fe750e9fdc8c5d2a8d of Tempest commit.
This patch makes TokenClientJSON deprecated and recommends to
use TokenClient instead.
Partially implements blueprint consistent-service-method-names
Change-Id: Icbf3bffddd22cb09628572c7a6d01735a123a0b0
b57c812f31