Fix misuse of assertTrue
Fix misuse of assertTrue

Replace assertTrue with assertEqual.

Change-Id: I918930a6fd3980297ee7d68dd6c9397416fb3335
Closes-Bug: 1988308
Signed-off-by: Takashi Natsume <2c48eb5bf73c355a2d5583bc776dffa383cdf819@gmail.com>

openstack/oslo.service